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Chen J, Yang X, Zhou F, Lau YC, Feng W, Yao Y, Li Y, Jiang Y, Wang W. Colossal anomalous Hall effect in the layered antiferromagnetic EuAl 2Si 2 compound. MATERIALS HORIZONS 2024. [PMID: 38990691 DOI: 10.1039/d4mh00480a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/13/2024]
Abstract
The anomalous Hall effect (AHE), significantly enhanced by the extrinsic mechanism, has attracted attention for its almost unlimited Hall response, which exceeds the upper limit of the Berry curvature mechanism. However, due to the high conductivity in the clean regime and weak skew scattering, it is a great challenge to obtain large anomalous Hall conductivities and large anomalous Hall angles at the same time. Here, we unveil a new magnetic metal system, EuAl2Si2, which hosts both colossal anomalous Hall conductivity (σAxy ≥ 104 Ω-1 cm-1) and large anomalous Hall angle (AHA >10%). The scaling relation suggests that the skew scattering mechanism is dominant in the colossal anomalous Hall response and gives rise to a large skew scattering constant. The large effective SOC and large magnetic moment may account for this anomaly. Our results indicate that EuAl2Si2 is a good platform to study the extrinsic AHE mechanism.
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Affiliation(s)
- Jie Chen
- School of Electronic and Information Engineering, Tiangong University, Tianjin 300387, China.
| | - Xiuxian Yang
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China
- Laboratory of Quantum Functional Materials Design and Application, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
| | - Feng Zhou
- School of Electronic and Information Engineering, Tiangong University, Tianjin 300387, China.
| | - Yong-Chang Lau
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wanxiang Feng
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China
| | - Yugui Yao
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China
| | - Yue Li
- School of Physical Science and Technology, Tiangong University, Tianjin 300387, China
| | - Yong Jiang
- School of Electronic and Information Engineering, Tiangong University, Tianjin 300387, China.
| | - Wenhong Wang
- School of Electronic and Information Engineering, Tiangong University, Tianjin 300387, China.
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2
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Wu W, Shi Z, Ozerov M, Du Y, Wang Y, Ni XS, Meng X, Jiang X, Wang G, Hao C, Wang X, Zhang P, Pan C, Pan H, Sun Z, Yang R, Xu Y, Hou Y, Yan Z, Zhang C, Lu HZ, Chu J, Yuan X. The discovery of three-dimensional Van Hove singularity. Nat Commun 2024; 15:2313. [PMID: 38485978 PMCID: PMC10940667 DOI: 10.1038/s41467-024-46626-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Accepted: 02/29/2024] [Indexed: 03/18/2024] Open
Abstract
Arising from the extreme/saddle point in electronic bands, Van Hove singularity (VHS) manifests divergent density of states (DOS) and induces various new states of matter such as unconventional superconductivity. VHS is believed to exist in one and two dimensions, but rarely found in three dimension (3D). Here, we report the discovery of 3D VHS in a topological magnet EuCd2As2 by magneto-infrared spectroscopy. External magnetic fields effectively control the exchange interaction in EuCd2As2, and shift 3D Weyl bands continuously, leading to the modification of Fermi velocity and energy dispersion. Above the critical field, the 3D VHS forms and is evidenced by the abrupt emergence of inter-band transitions, which can be quantitatively described by the minimal model of Weyl semimetals. Three additional optical transitions are further predicted theoretically and verified in magneto-near-infrared spectra. Our results pave the way to exploring VHS in 3D systems and uncovering the coordination between electronic correlation and the topological phase.
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Affiliation(s)
- Wenbin Wu
- State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China
- Key Laboratory of Polar Materials and Devices, Ministry of Education, School of Physics and Electronic Science, East China Normal University, 200241, Shanghai, China
- Shanghai Center of Brain-Inspired Intelligent Materials and Devices, East China Normal University, 200241, Shanghai, China
| | - Zeping Shi
- State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China
| | - Mykhaylo Ozerov
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, 32310, USA
| | - Yuhan Du
- State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China
| | - Yuxiang Wang
- State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, 200433, Shanghai, China
| | - Xiao-Sheng Ni
- Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-Sen University, 510275, Guangzhou, China
| | - Xianghao Meng
- State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China
| | - Xiangyu Jiang
- State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China
| | - Guangyi Wang
- State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China
| | - Congming Hao
- State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China
| | - Xinyi Wang
- State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China
| | - Pengcheng Zhang
- State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China
| | - Chunhui Pan
- Multifunctional Platform for Innovation Precision Machining Center, East China Normal University, 200241, Shanghai, China
| | - Haifeng Pan
- State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China
| | - Zhenrong Sun
- State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China
| | - Run Yang
- Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, 211189, Nanjing, China
| | - Yang Xu
- Key Laboratory of Polar Materials and Devices, Ministry of Education, School of Physics and Electronic Science, East China Normal University, 200241, Shanghai, China
| | - Yusheng Hou
- Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-Sen University, 510275, Guangzhou, China
| | - Zhongbo Yan
- Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-Sen University, 510275, Guangzhou, China
| | - Cheng Zhang
- State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, 200433, Shanghai, China
- Zhangjiang Fudan International Innovation Center, Fudan University, 201210, Shanghai, China
| | - Hai-Zhou Lu
- Shenzhen Institute for Quantum Science and Engineering and Department of Physics, Southern University of Science and Technology (SUSTech), 518055, Shenzhen, China
| | - Junhao Chu
- Key Laboratory of Polar Materials and Devices, Ministry of Education, School of Physics and Electronic Science, East China Normal University, 200241, Shanghai, China
- Institute of Optoelectronics, Fudan University, 200438, Shanghai, China
| | - Xiang Yuan
- State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, China.
- Key Laboratory of Polar Materials and Devices, Ministry of Education, School of Physics and Electronic Science, East China Normal University, 200241, Shanghai, China.
- Shanghai Center of Brain-Inspired Intelligent Materials and Devices, East China Normal University, 200241, Shanghai, China.
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3
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Cheng E, Yan L, Shi X, Lou R, Fedorov A, Behnami M, Yuan J, Yang P, Wang B, Cheng JG, Xu Y, Xu Y, Xia W, Pavlovskii N, Peets DC, Zhao W, Wan Y, Burkhardt U, Guo Y, Li S, Felser C, Yang W, Büchner B. Tunable positions of Weyl nodes via magnetism and pressure in the ferromagnetic Weyl semimetal CeAlSi. Nat Commun 2024; 15:1467. [PMID: 38368411 PMCID: PMC10874455 DOI: 10.1038/s41467-024-45658-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Accepted: 01/30/2024] [Indexed: 02/19/2024] Open
Abstract
The noncentrosymmetric ferromagnetic Weyl semimetal CeAlSi with simultaneous space-inversion and time-reversal symmetry breaking provides a unique platform for exploring novel topological states. Here, by employing multiple experimental techniques, we demonstrate that ferromagnetism and pressure can serve as efficient parameters to tune the positions of Weyl nodes in CeAlSi. At ambient pressure, a magnetism-facilitated anomalous Hall/Nernst effect (AHE/ANE) is uncovered. Angle-resolved photoemission spectroscopy (ARPES) measurements demonstrated that the Weyl nodes with opposite chirality are moving away from each other upon entering the ferromagnetic phase. Under pressure, by tracing the pressure evolution of AHE and band structure, we demonstrate that pressure could also serve as a pivotal knob to tune the positions of Weyl nodes. Moreover, multiple pressure-induced phase transitions are also revealed. These findings indicate that CeAlSi provides a unique and tunable platform for exploring exotic topological physics and electron correlations, as well as catering to potential applications, such as spintronics.
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Affiliation(s)
- Erjian Cheng
- Leibniz Institute for Solid State and Materials Research (IFW-Dresden), 01069, Dresden, Germany.
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
| | - Limin Yan
- Center for High Pressure Science and Technology Advanced Research, 201203, Shanghai, China
- State Key Laboratory of Superhard Materials, Department of Physics, Jilin University, 130012, Changchun, China
| | - Xianbiao Shi
- State Key Laboratory of Advanced Welding & Joining, Harbin Institute of Technology, 150001, Harbin, China
- Flexible Printed Electronics Technology Center, Harbin Institute of Technology (Shenzhen), 518055, Shenzhen, China
| | - Rui Lou
- Leibniz Institute for Solid State and Materials Research (IFW-Dresden), 01069, Dresden, Germany.
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489, Berlin, Germany.
- Joint Laboratory "Functional Quantum Materials" at BESSY II, 12489, Berlin, Germany.
| | - Alexander Fedorov
- Leibniz Institute for Solid State and Materials Research (IFW-Dresden), 01069, Dresden, Germany
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489, Berlin, Germany
- Joint Laboratory "Functional Quantum Materials" at BESSY II, 12489, Berlin, Germany
| | - Mahdi Behnami
- Leibniz Institute for Solid State and Materials Research (IFW-Dresden), 01069, Dresden, Germany
| | - Jian Yuan
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China
| | - Pengtao Yang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China
- School of Physical Sciences, University of Chinese Academy of Sciences, 100190, Beijing, China
| | - Bosen Wang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China
- School of Physical Sciences, University of Chinese Academy of Sciences, 100190, Beijing, China
| | - Jin-Guang Cheng
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China
- School of Physical Sciences, University of Chinese Academy of Sciences, 100190, Beijing, China
| | - Yuanji Xu
- Institute for Applied Physics, University of Science and Technology Beijing, 100083, Beijing, China
| | - Yang Xu
- Key Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal University, 200241, Shanghai, China
| | - Wei Xia
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China
| | - Nikolai Pavlovskii
- Institute of Solid State and Materials Physics, Technische Universität Dresden, 01069, Dresden, Germany
| | - Darren C Peets
- Institute of Solid State and Materials Physics, Technische Universität Dresden, 01069, Dresden, Germany
| | - Weiwei Zhao
- State Key Laboratory of Advanced Welding & Joining, Harbin Institute of Technology, 150001, Harbin, China
- Flexible Printed Electronics Technology Center, Harbin Institute of Technology (Shenzhen), 518055, Shenzhen, China
| | - Yimin Wan
- State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, 200438, Shanghai, China
| | - Ulrich Burkhardt
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
| | - Yanfeng Guo
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China
| | - Shiyan Li
- State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, 200438, Shanghai, China
- Collaborative Innovation Center of Advanced Microstructures, 210093, Nanjing, China
- Shanghai Research Center for Quantum Sciences, 201315, Shanghai, China
| | - Claudia Felser
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
| | - Wenge Yang
- Center for High Pressure Science and Technology Advanced Research, 201203, Shanghai, China.
| | - Bernd Büchner
- Leibniz Institute for Solid State and Materials Research (IFW-Dresden), 01069, Dresden, Germany.
- Institute of Solid State and Materials Physics and Würzburg-Dresden Cluster of Excellence-ct.qmat, Technische Universität Dresden, 01062, Dresden, Germany.
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4
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Li C, Zhang J, Wang Y, Liu H, Guo Q, Rienks E, Chen W, Bertran F, Yang H, Phuyal D, Fedderwitz H, Thiagarajan B, Dendzik M, Berntsen MH, Shi Y, Xiang T, Tjernberg O. Emergence of Weyl fermions by ferrimagnetism in a noncentrosymmetric magnetic Weyl semimetal. Nat Commun 2023; 14:7185. [PMID: 37938548 PMCID: PMC10632385 DOI: 10.1038/s41467-023-42996-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 10/26/2023] [Indexed: 11/09/2023] Open
Abstract
Condensed matter physics has often provided a platform for investigating the interplay between particles and fields in cases that have not been observed in high-energy physics. Here, using angle-resolved photoemission spectroscopy, we provide an example of this by visualizing the electronic structure of a noncentrosymmetric magnetic Weyl semimetal candidate NdAlSi in both the paramagnetic and ferrimagnetic states. We observe surface Fermi arcs and bulk Weyl fermion dispersion as well as the emergence of new Weyl fermions in the ferrimagnetic state. Our results establish NdAlSi as a magnetic Weyl semimetal and provide an experimental observation of ferrimagnetic regulation of Weyl fermions in condensed matter.
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Affiliation(s)
- Cong Li
- Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, 11419, Sweden.
- Department of Applied Physics, Stanford University, Stanford, CA, 94305, USA.
| | - Jianfeng Zhang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Yang Wang
- Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, 11419, Sweden
| | - Hongxiong Liu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Qinda Guo
- Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, 11419, Sweden
| | - Emile Rienks
- Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein-Straße 15, 12489, Berlin, Germany
| | - Wanyu Chen
- Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, 11419, Sweden
| | - Francois Bertran
- Synchrotron SOLEIL, L'Orme des Merisiers, Départementale 128, 91190, Saint-Aubin, France
| | - Huancheng Yang
- Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing, 100872, China
| | - Dibya Phuyal
- Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, 11419, Sweden
| | | | | | - Maciej Dendzik
- Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, 11419, Sweden
| | - Magnus H Berntsen
- Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, 11419, Sweden
| | - Youguo Shi
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Tao Xiang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Oscar Tjernberg
- Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, 11419, Sweden.
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5
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Santos-Cottin D, Mohelský I, Wyzula J, Le Mardelé F, Kapon I, Nasrallah S, Barišić N, Živković I, Soh JR, Guo F, Rigaux K, Puppin M, Dil JH, Gudac B, Rukelj Z, Novak M, Kuzmenko AB, Homes CC, Dietl T, Orlita M, Akrap A. EuCd_{2}As_{2}: A Magnetic Semiconductor. PHYSICAL REVIEW LETTERS 2023; 131:186704. [PMID: 37977632 DOI: 10.1103/physrevlett.131.186704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 05/22/2023] [Accepted: 10/10/2023] [Indexed: 11/19/2023]
Abstract
EuCd_{2}As_{2} is now widely accepted as a topological semimetal in which a Weyl phase is induced by an external magnetic field. We challenge this view through firm experimental evidence using a combination of electronic transport, optical spectroscopy, and excited-state photoemission spectroscopy. We show that the EuCd_{2}As_{2} is in fact a semiconductor with a gap of 0.77 eV. We show that the externally applied magnetic field has a profound impact on the electronic band structure of this system. This is manifested by a huge decrease of the observed band gap, as large as 125 meV at 2 T, and, consequently, by a giant redshift of the interband absorption edge. However, the semiconductor nature of the material remains preserved. EuCd_{2}As_{2} is therefore a magnetic semiconductor rather than a Dirac or Weyl semimetal, as suggested by ab initio computations carried out within the local spin-density approximation.
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Affiliation(s)
- D Santos-Cottin
- Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
| | - I Mohelský
- LNCMI, CNRS-UGA-UPS-INSA, 25, avenue des Martyrs, F-38042 Grenoble, France
| | - J Wyzula
- Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
- LNCMI, CNRS-UGA-UPS-INSA, 25, avenue des Martyrs, F-38042 Grenoble, France
| | - F Le Mardelé
- Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
- LNCMI, CNRS-UGA-UPS-INSA, 25, avenue des Martyrs, F-38042 Grenoble, France
| | - I Kapon
- Department of Physics, University of Geneva, CH-1204 Geneva, Switzerland
| | - S Nasrallah
- Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
- Institute of Solid State Physics, TU Wien, A-1040 Vienna, Austria
| | - N Barišić
- Institute of Solid State Physics, TU Wien, A-1040 Vienna, Austria
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička 32, HR-10000 Zagreb, Croatia
| | - I Živković
- Institut de Physique, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - J R Soh
- Institut de Physique, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - F Guo
- Institut de Physique, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
- Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - K Rigaux
- Institut de Physique, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
- Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - M Puppin
- Institut de Physique, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
- Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - J H Dil
- Institut de Physique, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
- Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - B Gudac
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička 32, HR-10000 Zagreb, Croatia
| | - Z Rukelj
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička 32, HR-10000 Zagreb, Croatia
| | - M Novak
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička 32, HR-10000 Zagreb, Croatia
| | - A B Kuzmenko
- Department of Physics, University of Geneva, CH-1204 Geneva, Switzerland
| | - C C Homes
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Tomasz Dietl
- International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland
- WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - M Orlita
- LNCMI, CNRS-UGA-UPS-INSA, 25, avenue des Martyrs, F-38042 Grenoble, France
- Institute of Physics, Charles University, CZ-12116 Prague, Czech Republic
| | - Ana Akrap
- Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
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6
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Drucker NC, Nguyen T, Han F, Siriviboon P, Luo X, Andrejevic N, Zhu Z, Bednik G, Nguyen QT, Chen Z, Nguyen LK, Liu T, Williams TJ, Stone MB, Kolesnikov AI, Chi S, Fernandez-Baca J, Nelson CS, Alatas A, Hogan T, Puretzky AA, Huang S, Yu Y, Li M. Topology stabilized fluctuations in a magnetic nodal semimetal. Nat Commun 2023; 14:5182. [PMID: 37626027 PMCID: PMC10457388 DOI: 10.1038/s41467-023-40765-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 08/07/2023] [Indexed: 08/27/2023] Open
Abstract
The interplay between magnetism and electronic band topology enriches topological phases and has promising applications. However, the role of topology in magnetic fluctuations has been elusive. Here, we report evidence for topology stabilized magnetism above the magnetic transition temperature in magnetic Weyl semimetal candidate CeAlGe. Electrical transport, thermal transport, resonant elastic X-ray scattering, and dilatometry consistently indicate the presence of locally correlated magnetism within a narrow temperature window well above the thermodynamic magnetic transition temperature. The wavevector of this short-range order is consistent with the nesting condition of topological Weyl nodes, suggesting that it arises from the interaction between magnetic fluctuations and the emergent Weyl fermions. Effective field theory shows that this topology stabilized order is wavevector dependent and can be stabilized when the interband Weyl fermion scattering is dominant. Our work highlights the role of electronic band topology in stabilizing magnetic order even in the classically disordered regime.
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Affiliation(s)
- Nathan C Drucker
- Quantum Measurement Group, MIT, Cambridge, MA, USA.
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA.
| | - Thanh Nguyen
- Quantum Measurement Group, MIT, Cambridge, MA, USA
- Department of Nuclear Science and Engineering, MIT, Cambridge, MA, USA
| | - Fei Han
- Quantum Measurement Group, MIT, Cambridge, MA, USA
- Department of Nuclear Science and Engineering, MIT, Cambridge, MA, USA
| | - Phum Siriviboon
- Quantum Measurement Group, MIT, Cambridge, MA, USA
- Department of Physics, MIT, Cambridge, MA, USA
| | - Xi Luo
- College of Science, University of Shanghai for Science and Technology, Shanghai, China
| | | | - Ziming Zhu
- School of Physics and Electronics, Hunan Normal University, Changsha, China
| | - Grigory Bednik
- Department of Nuclear Science and Engineering, MIT, Cambridge, MA, USA
| | | | - Zhantao Chen
- SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | | | | | - Travis J Williams
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Matthew B Stone
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | | | - Songxue Chi
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | | | - Christie S Nelson
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, USA
| | - Ahmet Alatas
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL, USA
| | - Tom Hogan
- Quantum Design, Inc., San Diego, CA, USA
| | - Alexander A Puretzky
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Shengxi Huang
- Department of Electrical Engineering, Rice University, Houston, TX, USA
| | - Yue Yu
- Department of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai, China.
| | - Mingda Li
- Quantum Measurement Group, MIT, Cambridge, MA, USA.
- Department of Nuclear Science and Engineering, MIT, Cambridge, MA, USA.
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7
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Averyanov DV, Sokolov IS, Taldenkov AN, Parfenov OE, Karateev IA, Kondratev OA, Tokmachev AM, Storchak VG. Intrinsic exchange bias state in silicene and germanene materials EuX 2. NANOSCALE HORIZONS 2023; 8:803-811. [PMID: 36987577 DOI: 10.1039/d3nh00009e] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
2D magnets have recently emerged as a host for unconventional phases and related phenomena. The prominence of 2D magnetism stems from its high amenability to external stimuli and structural variations. The low dimensionality facilitates competition between magnetic orders which may give rise to exchange bias, in particular in magnetic heterostructures. Here, we propose a strategy for the search of exchange bias state in 2D individual compounds. We track the evolution of magnetic orders driven by the number of monolayers in a system exhibiting antiferromagnetism in the multilayer and ferromagnetism in the monolayer limit. The material, EuSi2, has the structure of multilayer silicene intercalated by Eu. A strong intrinsic exchange bias effect accompanies the dimensional crossover. Comparison with silicene-based GdSi2 and germanene-based EuGe2 suggests the competition between magnetic orders to be a common property of this class of materials that may be useful in spintronic applications.
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Affiliation(s)
- Dmitry V Averyanov
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, Moscow 123182, Russia.
| | - Ivan S Sokolov
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, Moscow 123182, Russia.
| | - Alexander N Taldenkov
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, Moscow 123182, Russia.
| | - Oleg E Parfenov
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, Moscow 123182, Russia.
| | - Igor A Karateev
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, Moscow 123182, Russia.
| | - Oleg A Kondratev
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, Moscow 123182, Russia.
| | - Andrey M Tokmachev
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, Moscow 123182, Russia.
| | - Vyacheslav G Storchak
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, Moscow 123182, Russia.
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8
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Sun W, Li B, Zou X, Li R, Huang B, Dai Y, Niu C. Magnetic Weyl Semimetal in BaCrSe 2 with Long-Distance Distribution of Weyl Points. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023:e2301474. [PMID: 37246266 PMCID: PMC10401091 DOI: 10.1002/advs.202301474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 04/24/2023] [Indexed: 05/30/2023]
Abstract
Weyl semimetals (WSMs) have attracted great attentions that provide intriguing platforms for exploring fundamental physical phenomena and future topotronics applications. Despite the fact that numerous WSMs are achieved, WSMs with long-distance distribution of Weyl points (WPs) in given material candidates remain elusive. Here, the emergence of intrinsic ferromagnetic WSMs in BaCrSe2 with the nontrivial nature explicitly confirmed by the Chern number and Fermi arc surface states analysis is theoretically demonstrated. Remarkably, unlike previous WSMs for which opposite chirality WPs are located very close to each other, the WPs of BaCrSe2 host a long-distance distribution, as much as half of the reciprocal space vector, suggesting that the WPs are highly robust and difficult to be annihilated by perturbations. The presented results not only advance the general understanding of magnetic WSMs but also put forward potential applications in topotronics.
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Affiliation(s)
- Wenli Sun
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China
| | - Bingyang Li
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China
| | - Xiaorong Zou
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China
| | - Runhan Li
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China
| | - Baibiao Huang
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China
| | - Ying Dai
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China
| | - Chengwang Niu
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China
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9
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Roychowdhury S, Yao M, Samanta K, Bae S, Chen D, Ju S, Raghavan A, Kumar N, Constantinou P, Guin SN, Plumb NC, Romanelli M, Borrmann H, Vergniory MG, Strocov VN, Madhavan V, Shekhar C, Felser C. Anomalous Hall Conductivity and Nernst Effect of the Ideal Weyl Semimetallic Ferromagnet EuCd 2 As 2. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2207121. [PMID: 36828783 PMCID: PMC10161038 DOI: 10.1002/advs.202207121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 01/22/2023] [Indexed: 05/06/2023]
Abstract
Weyl semimetal is a unique topological phase with topologically protected band crossings in the bulk and robust surface states called Fermi arcs. Weyl nodes always appear in pairs with opposite chiralities, and they need to have either time-reversal or inversion symmetry broken. When the time-reversal symmetry is broken the minimum number of Weyl points (WPs) is two. If these WPs are located at the Fermi level, they form an ideal Weyl semimetal (WSM). In this study, intrinsic ferromagnetic (FM) EuCd2 As2 are grown, predicted to be an ideal WSM and studied its electronic structure by angle-resolved photoemission spectroscopy, and scanning tunneling microscopy which agrees closely with the first principles calculations. Moreover, anomalous Hall conductivity and Nernst effect are observed, resulting from the non-zero Berry curvature, and the topological Hall effect arising from changes in the band structure caused by spin canting produced by magnetic fields. These findings can help realize several exotic quantum phenomena in inorganic topological materials that are otherwise difficult to assess because of the presence of multiple pairs of Weyl nodes.
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Affiliation(s)
| | - Mengyu Yao
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
| | - Kartik Samanta
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
| | - Seokjin Bae
- Department of Physics and Materials Research Laboratory, University of Illinois Urbana, Champaign, Urbana, IL, 61801, USA
| | - Dong Chen
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
| | - Sailong Ju
- Swiss Light Source, Paul Scherrer Institute, Villigen-PSI, CH-5232, Switzerland
| | - Arjun Raghavan
- Department of Physics and Materials Research Laboratory, University of Illinois Urbana, Champaign, Urbana, IL, 61801, USA
| | - Nitesh Kumar
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
- S. N. Bose National Centre for Basic Sciences, Salt Lake City, Kolkata, 700 106, India
| | | | - Satya N Guin
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
- Department of Chemistry, Birla Institute of Technology and Science, Pilani - Hyderabad Campus, Hyderabad, 500078, India
| | | | - Marisa Romanelli
- Department of Physics and Materials Research Laboratory, University of Illinois Urbana, Champaign, Urbana, IL, 61801, USA
| | - Horst Borrmann
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
| | - Maia G Vergniory
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
- Donostia International Physics Center, Donostia-San Sebastian, 20018, Spain
| | - Vladimir N Strocov
- Swiss Light Source, Paul Scherrer Institute, Villigen-PSI, CH-5232, Switzerland
| | - Vidya Madhavan
- Department of Physics and Materials Research Laboratory, University of Illinois Urbana, Champaign, Urbana, IL, 61801, USA
| | - Chandra Shekhar
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
| | - Claudia Felser
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
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10
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Bukowski Z, Rybicki D, Babij M, Przewoźnik J, Gondek Ł, Żukrowski J, Kapusta C. Canted antiferromagnetic order in EuZn 2As 2 single crystals. Sci Rep 2022; 12:14718. [PMID: 36042369 PMCID: PMC9427830 DOI: 10.1038/s41598-022-19026-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 08/23/2022] [Indexed: 11/09/2022] Open
Abstract
Compounds containing Eu show a vast range of unique physical properties due to the interplay of electronic and magnetic properties, which can lead to a nontrivial electronic topology combined with magnetic order. We report on the growth of trigonal (\documentclass[12pt]{minimal}
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\begin{document}$$P\overline{3 }m1$$\end{document}P3¯m1 space group) EuZn2As2 single crystals and on the studies of their structural, electronic and magnetic properties. A range of experimental techniques was applied including X-ray diffraction, electron microscopy, magnetic susceptibility, magnetization, heat capacity and Mössbauer spectroscopy in the study. We found that Eu has solely a 2+ valence state and its magnetic moments below TN = 19.2 K form a canted antiferromagnetic structure, tilted from the basal plane.
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Affiliation(s)
- Zbigniew Bukowski
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-422, Wrocław, Poland.
| | - Damian Rybicki
- Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Av. A. Mickiewicza 30, 30-059, Kraków, Poland.
| | - Michał Babij
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-422, Wrocław, Poland
| | - Janusz Przewoźnik
- Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Av. A. Mickiewicza 30, 30-059, Kraków, Poland
| | - Łukasz Gondek
- Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Av. A. Mickiewicza 30, 30-059, Kraków, Poland
| | - Jan Żukrowski
- Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, Av. A. Mickiewicza 30, 30-059, Kraków, Poland
| | - Czesław Kapusta
- Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Av. A. Mickiewicza 30, 30-059, Kraków, Poland
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11
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Sukhachov PO, Glazman LI. Anomalous Electromagnetic Field Penetration in a Weyl or Dirac Semimetal. PHYSICAL REVIEW LETTERS 2022; 128:146801. [PMID: 35476468 DOI: 10.1103/physrevlett.128.146801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 01/03/2022] [Accepted: 03/08/2022] [Indexed: 06/14/2023]
Abstract
The current response to an electromagnetic field in a Weyl or Dirac semimetal becomes nonlocal due to the chiral anomaly activated by an applied static magnetic field. The nonlocality develops under the conditions of the normal skin effect and is related to the valley charge imbalance generated by the joint effect of the electric field of the impinging wave and the static magnetic field. We elucidate the signatures of this nonlocality in the transmission of electromagnetic waves. The signatures include enhancement of the transmission amplitude and its specific dependence on the wave's frequency and the static magnetic field strength.
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Affiliation(s)
- P O Sukhachov
- Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - L I Glazman
- Department of Physics, Yale University, New Haven, Connecticut 06520, USA
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12
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Du Y, Chen J, Wu W, Shi Z, Meng X, Zhang C, Gong S, Chu J, Yuan X. Comparative Raman spectroscopy of magnetic topological material EuCd 2X 2(X =P, As). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:224001. [PMID: 35362463 DOI: 10.1088/1361-648x/ac5d1b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Accepted: 03/11/2022] [Indexed: 06/14/2023]
Abstract
EuCd2X2(X = P, As) is a new class of magnetic topological materials discovered recently. The electronic structure and the band topology are intimately coupled with its magnetism, giving rise to interesting properties such as spin fluctuation and colossal magnetoresistance. Phonon excitation can contribute to the quasi-particle response of the topological matters through spin-lattice and electron-phonon coupling. However, the phonon properties of this material family remain unexplored. Here we report a comparative study of Raman-active vibration modes in EuCd2X2(X = P, As) by means of angle-resolved, temperature-resolved, and magnetic-field-resolved Raman spectroscopy together with the first-principle calculations and Raman tensor analysis. The phonon properties can be tuned by chemical potential and temperature within the material family. All the phonon modes are softened with increased chemical pressure by replacing P with As. Angle-resolved polarized Raman spectroscopy reveals the configuration-sensitive Raman activity and the isotropic intensity response. In addition, the magneto-Raman spectrum indicates the stability of Raman-active vibration modes against the magnetic field at room temperature. Our work sheds light on the phonon dynamics of magnetic topological matters, which are potentially coupled with the topological charge and spin excitation.
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Affiliation(s)
- Yuhan Du
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, People's Republic of China
| | - Ju Chen
- Department of Physics, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, People's Republic of China
| | - Wenbin Wu
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, People's Republic of China
| | - Zeping Shi
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, People's Republic of China
| | - Xianghao Meng
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, People's Republic of China
| | - Cheng Zhang
- Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, People's Republic of China
| | - Shijing Gong
- Department of Physics, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, People's Republic of China
| | - Junhao Chu
- Department of Physics, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, People's Republic of China
- Institute of Optoelectronics, Fudan University, Shanghai 200433, People's Republic of China
- Key Laboratory of Polar Materials and Devices (Ministry of Education), East China Normal University, Shanghai 200241, People's Republic of China
| | - Xiang Yuan
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, People's Republic of China
- Department of Physics, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, People's Republic of China
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13
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Guo W, Huang Z, Zhang JM. The Zintl phases compound AEIn 2As 2 (AE=Ca, Sr, Ba): topological phase transition under pressure. Phys Chem Chem Phys 2022; 24:17337-17347. [DOI: 10.1039/d2cp01764d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
AEIn2As2 (AE=Ca, Sr, Ba), as a new crucial nonmagnetic thermoelectric candidate, is desired to be understood in terms of its potential physical properties and controversial structural phases in both experimental...
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14
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Jo NH, Wu Y, Trevisan TV, Wang LL, Lee K, Kuthanazhi B, Schrunk B, Bud'ko SL, Canfield PC, Orth PP, Kaminski A. Visualizing band selective enhancement of quasiparticle lifetime in a metallic ferromagnet. Nat Commun 2021; 12:7169. [PMID: 34887396 PMCID: PMC8660887 DOI: 10.1038/s41467-021-27277-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Accepted: 11/04/2021] [Indexed: 11/09/2022] Open
Abstract
Electrons navigate more easily in a background of ordered magnetic moments than around randomly oriented ones. This fundamental quantum mechanical principle is due to their Bloch wave nature and also underlies ballistic electronic motion in a perfect crystal. As a result, a paramagnetic metal that develops ferromagnetic order often experiences a sharp drop in the resistivity. Despite the universality of this phenomenon, a direct observation of the impact of ferromagnetic order on the electronic quasiparticles in a magnetic metal is still lacking. Here we demonstrate that quasiparticles experience a significant enhancement of their lifetime in the ferromagnetic state of the low-density magnetic semimetal EuCd2As2, but this occurs only in selected bands and specific energy ranges. This is a direct consequence of the magnetically induced band splitting and the multi-orbital nature of the material. Our detailed study allows to disentangle different electronic scattering mechanisms due to non-magnetic disorder and magnon exchange. Such high momentum and energy dependence quasiparticle lifetime enhancement can lead to spin selective transport and potential spintronic applications.
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Affiliation(s)
- Na Hyun Jo
- Division of Materials Science and Engineering, Ames Laboratory, Ames, IA, 50011, USA
- Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA
| | - Yun Wu
- Division of Materials Science and Engineering, Ames Laboratory, Ames, IA, 50011, USA
- Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA
| | - Thaís V Trevisan
- Division of Materials Science and Engineering, Ames Laboratory, Ames, IA, 50011, USA
- Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA
| | - Lin-Lin Wang
- Division of Materials Science and Engineering, Ames Laboratory, Ames, IA, 50011, USA
| | - Kyungchan Lee
- Division of Materials Science and Engineering, Ames Laboratory, Ames, IA, 50011, USA
- Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA
- Physikalisches Institut, Universität Würzburg, D-97074, Würzburg, Germany
- Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, D-97074, Würzburg, Germany
| | - Brinda Kuthanazhi
- Division of Materials Science and Engineering, Ames Laboratory, Ames, IA, 50011, USA
- Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA
| | - Benjamin Schrunk
- Division of Materials Science and Engineering, Ames Laboratory, Ames, IA, 50011, USA
- Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA
| | - S L Bud'ko
- Division of Materials Science and Engineering, Ames Laboratory, Ames, IA, 50011, USA
- Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA
| | - P C Canfield
- Division of Materials Science and Engineering, Ames Laboratory, Ames, IA, 50011, USA
- Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA
| | - P P Orth
- Division of Materials Science and Engineering, Ames Laboratory, Ames, IA, 50011, USA
- Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA
| | - Adam Kaminski
- Division of Materials Science and Engineering, Ames Laboratory, Ames, IA, 50011, USA.
- Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA.
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15
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Cheng E, Xia W, Shi X, Fang H, Wang C, Xi C, Xu S, Peets DC, Wang L, Su H, Pi L, Ren W, Wang X, Yu N, Chen Y, Zhao W, Liu Z, Guo Y, Li S. Magnetism-induced topological transition in EuAs 3. Nat Commun 2021; 12:6970. [PMID: 34848690 PMCID: PMC8635340 DOI: 10.1038/s41467-021-26482-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 09/28/2021] [Indexed: 11/09/2022] Open
Abstract
The nature of the interaction between magnetism and topology in magnetic topological semimetals remains mysterious, but may be expected to lead to a variety of novel physics. We systematically studied the magnetic semimetal EuAs3, demonstrating a magnetism-induced topological transition from a topological nodal-line semimetal in the paramagnetic or the spin-polarized state to a topological massive Dirac metal in the antiferromagnetic ground state at low temperature. The topological nature in the antiferromagnetic state and the spin-polarized state has been verified by electrical transport measurements. An unsaturated and extremely large magnetoresistance of ~2 × 105% at 1.8 K and 28.3 T is observed. In the paramagnetic states, the topological nodal-line structure at the Y point is proven by angle-resolved photoemission spectroscopy. Moreover, a temperature-induced Lifshitz transition accompanied by the emergence of a new band below 3 K is revealed. These results indicate that magnetic EuAs3 provides a rich platform to explore exotic physics arising from the interaction of magnetism with topology.
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Affiliation(s)
- Erjian Cheng
- State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, 200433, Shanghai, China
| | - Wei Xia
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China
- ShanghaiTech Laboratory for Topological Physics, 201210, Shanghai, China
| | - Xianbiao Shi
- State Key Laboratory of Advanced Welding & Joining and Flexible Printed Electronics Technology Center, Harbin Institute of Technology, 518055, Shenzhen, China
- Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education, Harbin Institute of Technology, 150001, Harbin, China
| | - Hongwei Fang
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China
- University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Chengwei Wang
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China
- State Key Laboratory of Functional Material for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 200050, Shanghai, China
| | - Chuanying Xi
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Sciences, 230031, Hefei, Anhui, China
| | - Shaowen Xu
- Department of Physics, Shanghai University, 200444, Shanghai, China
| | - Darren C Peets
- Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 315201, Ningbo, Zhejiang, China
- Institute for Solid State and Materials Physics, Technical University of Dresden, 01062, Dresden, Germany
| | - Linshu Wang
- State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, 200433, Shanghai, China
| | - Hao Su
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China
| | - Li Pi
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Sciences, 230031, Hefei, Anhui, China
| | - Wei Ren
- Department of Physics, Shanghai University, 200444, Shanghai, China
| | - Xia Wang
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China
| | - Na Yu
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China
| | - Yulin Chen
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China
- ShanghaiTech Laboratory for Topological Physics, 201210, Shanghai, China
- Department of Physics, University of Oxford, Oxford, OX1 3PU, UK
| | - Weiwei Zhao
- State Key Laboratory of Advanced Welding & Joining and Flexible Printed Electronics Technology Center, Harbin Institute of Technology, 518055, Shenzhen, China
- Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education, Harbin Institute of Technology, 150001, Harbin, China
| | - Zhongkai Liu
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China.
- ShanghaiTech Laboratory for Topological Physics, 201210, Shanghai, China.
| | - Yanfeng Guo
- School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China.
| | - Shiyan Li
- State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, 200433, Shanghai, China.
- Collaborative Innovation Center of Advanced Microstructures, 210093, Nanjing, China.
- Shanghai Research Center for Quantum Sciences, 201315, Shanghai, China.
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16
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Parfenov OE, Averyanov DV, Sokolov IS, Taldenkov AN, Karateev IA, Tokmachev AM, Storchak VG. High Carrier Mobility in a Layered Antiferromagnet Integrated with Silicon. ACS APPLIED MATERIALS & INTERFACES 2021; 13:41926-41932. [PMID: 34436853 DOI: 10.1021/acsami.1c13623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Coupling various functional properties in one material is always a challenge, more so if the material should be nanostructured for practical applications. Magnetism and high carrier mobility are key components for spintronic applications but rather difficult to bundle together. Here, we establish EuAl2Si2 as a layered antiferromagnet supporting high carrier mobility. Its topotactic synthesis via a sacrificial two-dimensional template results in epitaxial nanoscale films on silicon. Their outstanding structural quality and atomically sharp interfaces are demonstrated by diffraction and microscopy techniques. EuAl2Si2 films exhibit extreme magnetoresistance and a carrier mobility of above 10,000 cm2 V-1 s-1. The marriage of these properties and magnetism makes EuAl2Si2 a promising spintronic material. Importantly, the seamless integration of EuAl2Si2 with silicon technology is particularly appealing for applications.
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Affiliation(s)
- Oleg E Parfenov
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, 123182 Moscow, Russia
| | - Dmitry V Averyanov
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, 123182 Moscow, Russia
| | - Ivan S Sokolov
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, 123182 Moscow, Russia
| | - Alexander N Taldenkov
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, 123182 Moscow, Russia
| | - Igor A Karateev
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, 123182 Moscow, Russia
| | - Andrey M Tokmachev
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, 123182 Moscow, Russia
| | - Vyacheslav G Storchak
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, 123182 Moscow, Russia
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17
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Lin W, Liu L, Liu Q, Li L, Shu X, Li C, Xie Q, Jiang P, Zheng X, Guo R, Lim Z, Zeng S, Zhou G, Wang H, Zhou J, Yang P, Pennycook SJ, Xu X, Zhong Z, Wang Z, Chen J. Electric Field Control of the Magnetic Weyl Fermion in an Epitaxial SrRuO 3 (111) Thin Film. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2101316. [PMID: 34302392 DOI: 10.1002/adma.202101316] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 05/17/2021] [Indexed: 06/13/2023]
Abstract
The magnetic Weyl fermion originates from the time reversal symmetry (TRS)-breaking in magnetic crystalline structures, where the topology and magnetism entangle with each other. Therefore, the magnetic Weyl fermion is expected to be effectively tuned by the magnetic field and electrical field, which holds promise for future topologically protected electronics. However, the electrical field control of the magnetic Weyl fermion has rarely been reported, which is prevented by the limited number of identified magnetic Weyl solids. Here, the electric field control of the magnetic Weyl fermion is demonstrated in an epitaxial SrRuO3 (111) thin film. The magnetic Weyl fermion in the SrRuO3 films is indicated by the chiral anomaly induced magnetotransport, and is verified by the observed Weyl nodes in the electronic structures characterized by the angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations. Through the ionic-liquid gating experiment, the effective manipulation of the Weyl fermion by electric field is demonstrated, in terms of the sign-change of the ordinary Hall effect, the nonmonotonic tuning of the anomalous Hall effect, and the observation of the linear magnetoresistance under proper gating voltages. The work may stimulate the searching and tuning of Weyl fermions in other magnetic materials, which are promising in energy-efficient electronics.
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Affiliation(s)
- Weinan Lin
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Liang Liu
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Qing Liu
- Key Laboratory of Magnetic Materials and Devices & Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
| | - Lei Li
- Key Laboratory of Magnetic Materials and Devices & Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072, China
| | - Xinyu Shu
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Changjian Li
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Qidong Xie
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Peiheng Jiang
- Key Laboratory of Magnetic Materials and Devices & Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
| | - Xuan Zheng
- Key Laboratory of Magnetic Materials and Devices & Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- Department of Chemical and Environmental Engineering, The University of Nottingham, Ningbo, 315042, China
| | - Rui Guo
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Zhishiuh Lim
- NUSNNI-Nanocore, National University of Singapore, Singapore, 117411, Singapore
| | - Shengwei Zeng
- NUSNNI-Nanocore, National University of Singapore, Singapore, 117411, Singapore
| | - Guowei Zhou
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemistry and Materials Science, Shanxi Normal University, Linfen, 041004, China
| | - Han Wang
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Jing Zhou
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Ping Yang
- Singapore Synchrotron Light Source (SSLS), National University of Singapore, Singapore, 117603, Singapore
| | - Stephen J Pennycook
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Xiaohong Xu
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemistry and Materials Science, Shanxi Normal University, Linfen, 041004, China
| | - Zhicheng Zhong
- Key Laboratory of Magnetic Materials and Devices & Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- China Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhiming Wang
- Key Laboratory of Magnetic Materials and Devices & Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- China Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Jingsheng Chen
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
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18
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19
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Observation of a singular Weyl point surrounded by charged nodal walls in PtGa. Nat Commun 2021; 12:3994. [PMID: 34183664 PMCID: PMC8239007 DOI: 10.1038/s41467-021-24289-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 06/10/2021] [Indexed: 11/08/2022] Open
Abstract
Constrained by the Nielsen-Ninomiya no-go theorem, in all so-far experimentally determined Weyl semimetals (WSMs) the Weyl points (WPs) always appear in pairs in the momentum space with no exception. As a consequence, Fermi arcs occur on surfaces which connect the projections of the WPs with opposite chiral charges. However, this situation can be circumvented in the case of unpaired WP, without relevant surface Fermi arc connecting its surface projection, appearing singularly, while its Berry curvature field is absorbed by nontrivial charged nodal walls. Here, combining angle-resolved photoemission spectroscopy with density functional theory calculations, we show experimentally that a singular Weyl point emerges in PtGa at the center of the Brillouin zone (BZ), which is surrounded by closed Weyl nodal walls located at the BZ boundaries and there is no Fermi arc connecting its surface projection. Our results reveal that nontrivial band crossings of different dimensionalities can emerge concomitantly in condensed matter, while their coexistence ensures the net topological charge of different dimensional topological objects to be zero. Our observation extends the applicable range of the original Nielsen-Ninomiya no-go theorem which was derived from zero dimensional paired WPs with opposite chirality.
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20
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Dirnberger D, Kresse G, Franchini C, Reticcioli M. Electronic State Unfolding for Plane Waves: Energy Bands, Fermi Surfaces, and Spectral Functions. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2021; 125:12921-12928. [PMID: 34276866 PMCID: PMC8282185 DOI: 10.1021/acs.jpcc.1c02318] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 05/26/2021] [Indexed: 05/22/2023]
Abstract
Present day computing facilities allow for first-principles density functional theory studies of complex physical and chemical phenomena. Often such calculations are linked to large supercells to adequately model the desired property. However, supercells are associated with small Brillouin zones in the reciprocal space, leading to folded electronic eigenstates that make the analysis and interpretation extremely challenging. Various techniques have been proposed and developed to reconstruct the electronic band structures of super cells unfolded into the reciprocal space of an ideal primitive cell. Here we propose an unfolding scheme embedded directly in the Vienna Ab initio Simulation Package (VASP) that requires modest computational resources and allows for an automatized mapping from the reciprocal space of the supercell to the primitive cell Brillouin zone. This algorithm can compute band structures, Fermi surfaces, and spectral functions by using an integrated postprocessing tool (bands4vasp). Here the method is applied to a selected variety of complex physical situations: the effect of doping on the band dispersion in the BaFe2(1-x)Ru2x As2 superconductor, the interaction between adsorbates and polaronic states on the TiO2(110) surface, and the band splitting induced by noncollinear spin fluctuations in EuCd2As2.
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Affiliation(s)
- David Dirnberger
- Faculty
of Physics and Center for Computational Materials Science, University of Vienna, 1090 Vienna, Austria
| | - Georg Kresse
- Faculty
of Physics and Center for Computational Materials Science, University of Vienna, 1090 Vienna, Austria
- VASP
Software GmbH, 1090 Vienna, Austria
| | - Cesare Franchini
- Faculty
of Physics and Center for Computational Materials Science, University of Vienna, 1090 Vienna, Austria
- Dipartimento
di Fisica e Astronomia, Università
di Bologna, 40127 Bologna, Italy
| | - Michele Reticcioli
- Faculty
of Physics and Center for Computational Materials Science, University of Vienna, 1090 Vienna, Austria
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21
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Wang ZY, Cheng XC, Wang BZ, Zhang JY, Lu YH, Yi CR, Niu S, Deng Y, Liu XJ, Chen S, Pan JW. Realization of an ideal Weyl semimetal band in a quantum gas with 3D spin-orbit coupling. Science 2021; 372:271-276. [PMID: 33859030 DOI: 10.1126/science.abc0105] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 03/12/2021] [Indexed: 11/02/2022]
Abstract
Weyl semimetals are three-dimensional (3D) gapless topological phases with Weyl cones in the bulk band. According to lattice theory, Weyl cones must come in pairs, with the minimum number of cones being two. A semimetal with only two Weyl cones is an ideal Weyl semimetal (IWSM). Here we report the experimental realization of an IWSM band by engineering 3D spin-orbit coupling for ultracold atoms. The topological Weyl points are clearly measured via the virtual slicing imaging technique in equilibrium and are further resolved in the quench dynamics. The realization of an IWSM band opens an avenue to investigate various exotic phenomena that are difficult to access in solids.
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Affiliation(s)
- Zong-Yao Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.,Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China.,Shanghai Research Center for Quantum Science, Shanghai 201315, China
| | - Xiang-Can Cheng
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.,Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China.,Shanghai Research Center for Quantum Science, Shanghai 201315, China
| | - Bao-Zong Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.,International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
| | - Jin-Yi Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.,Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China.,Shanghai Research Center for Quantum Science, Shanghai 201315, China
| | - Yue-Hui Lu
- International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.,CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Chang-Rui Yi
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.,Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China.,Shanghai Research Center for Quantum Science, Shanghai 201315, China
| | - Sen Niu
- International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.,CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Youjin Deng
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.,Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China.,Shanghai Research Center for Quantum Science, Shanghai 201315, China
| | - Xiong-Jun Liu
- International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China. .,CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Shuai Chen
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China. .,Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China.,Shanghai Research Center for Quantum Science, Shanghai 201315, China
| | - Jian-Wei Pan
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China. .,Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China.,Shanghai Research Center for Quantum Science, Shanghai 201315, China
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22
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Wang ZC, Rogers JD, Yao X, Nichols R, Atay K, Xu B, Franklin J, Sochnikov I, Ryan PJ, Haskel D, Tafti F. Colossal Magnetoresistance without Mixed Valence in a Layered Phosphide Crystal. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2005755. [PMID: 33511677 DOI: 10.1002/adma.202005755] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 01/07/2021] [Indexed: 06/12/2023]
Abstract
Materials with strong magnetoresistive responses are the backbone of spintronic technology, magnetic sensors, and hard drives. Among them, manganese oxides with a mixed valence and a cubic perovskite structure stand out due to their colossal magnetoresistance (CMR). A double exchange interaction underlies the CMR in manganates, whereby charge transport is enhanced when the spins on neighboring Mn3+ and Mn4+ ions are parallel. Prior efforts to find different materials or mechanisms for CMR resulted in a much smaller effect. Here an enormous CMR at low temperatures in EuCd2 P2 without manganese, oxygen, mixed valence, or cubic perovskite structure is shown. EuCd2 P2 has a layered trigonal lattice and exhibits antiferromagnetic ordering at 11 K. The magnitude of CMR (104 %) in as-grown crystals of EuCd2 P2 rivals the magnitude in optimized thin films of manganates. The magnetization, transport, and synchrotron X-ray data suggest that strong magnetic fluctuations are responsible for this phenomenon. The realization of CMR at low temperatures without heterovalency leads to a new regime for materials and technologies related to antiferromagnetic spintronics.
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Affiliation(s)
- Zhi-Cheng Wang
- Departments of Physics, Boston College, 140 Commonwealth Avenue, Chestnut Hill, MA, 02467, USA
| | - Jared D Rogers
- Departments of Physics, Boston College, 140 Commonwealth Avenue, Chestnut Hill, MA, 02467, USA
| | - Xiaohan Yao
- Departments of Physics, Boston College, 140 Commonwealth Avenue, Chestnut Hill, MA, 02467, USA
| | - Renee Nichols
- Departments of Physics, Boston College, 140 Commonwealth Avenue, Chestnut Hill, MA, 02467, USA
| | - Kemal Atay
- Departments of Physics, Boston College, 140 Commonwealth Avenue, Chestnut Hill, MA, 02467, USA
| | - Bochao Xu
- Physics Department, University of Connecticut, Storrs, CT, 06269, USA
| | - Jacob Franklin
- Physics Department, University of Connecticut, Storrs, CT, 06269, USA
| | - Ilya Sochnikov
- Physics Department, University of Connecticut, Storrs, CT, 06269, USA
- Institute of Material Science, University of Connecticut, Storrs, CT, 06269, USA
| | - Philip J Ryan
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA
- School of Physical Sciences, Dublin City University, Dublin 9, D09 V209, Ireland
| | - Daniel Haskel
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA
| | - Fazel Tafti
- Departments of Physics, Boston College, 140 Commonwealth Avenue, Chestnut Hill, MA, 02467, USA
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23
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Wang H, Mao N, Hu X, Dai Y, Huang B, Niu C. A magnetic topological insulator in two-dimensional EuCd 2Bi 2: giant gap with robust topology against magnetic transitions. MATERIALS HORIZONS 2021; 8:956-961. [PMID: 34821326 DOI: 10.1039/d0mh01214a] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Magnetic topological states open up exciting opportunities for exploring fundamental topological quantum physics and innovative design of topological spintronics devices. However, the nontrivial topologies, for most known magnetic topological states, are usually associated with and may be heavily deformed by fragile magnetism. Here, using a tight-binding model and first-principles calculations, we demonstrate that a highly robust magnetic topological insulator phase, which remains intact under both ferromagnetic and antiferromagnetic configurations, can emerge in two-dimensional EuCd2Bi2 quintuple layers. Because of spin-orbital coupling, an inverted gap with intrinsic band inversions occuring simultaneously for up and down spin channels is obtained, accompanied by a nonzero spin Chern number and a pair of gapless edge states, and remarkably the magnitude of the nontrivial band gap for EuCd2Bi2 reaches as much as 750 meV. Moreover, the robustness of the magnetic TI phase is further confirmed by rotating the magnetization directions, indicating that EuCd2Bi2 represents a promising material for understanding and utilizing the topological insulating states in two-dimensional spin-orbit magnets.
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Affiliation(s)
- Hao Wang
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.
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24
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Xu Y, Das L, Ma JZ, Yi CJ, Nie SM, Shi YG, Tiwari A, Tsirkin SS, Neupert T, Medarde M, Shi M, Chang J, Shang T. Unconventional Transverse Transport above and below the Magnetic Transition Temperature in Weyl Semimetal EuCd_{2}As_{2}. PHYSICAL REVIEW LETTERS 2021; 126:076602. [PMID: 33666464 DOI: 10.1103/physrevlett.126.076602] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 11/13/2020] [Accepted: 01/25/2021] [Indexed: 06/12/2023]
Abstract
As exemplified by the growing interest in the quantum anomalous Hall effect, the research on topology as an organizing principle of quantum matter is greatly enriched from the interplay with magnetism. In this vein, we present a combined electrical and thermoelectrical transport study on the magnetic Weyl semimetal EuCd_{2}As_{2}. Unconventional contribution to the anomalous Hall and anomalous Nernst effects were observed both above and below the magnetic transition temperature of EuCd_{2}As_{2}, indicating the existence of significant Berry curvature. EuCd_{2}As_{2} represents a rare case in which this unconventional transverse transport emerges both above and below the magnetic transition temperature in the same material. The transport properties evolve with temperature and field in the antiferromagnetic phase in a different manner than in the paramagnetic phase, suggesting different mechanisms to their origin. Our results indicate EuCd_{2}As_{2} is a fertile playground for investigating the interplay between magnetism and topology, and potentially a plethora of topologically nontrivial phases rooted in this interplay.
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Affiliation(s)
- Y Xu
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - L Das
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - J Z Ma
- Department of Physics, City University of Hong Kong, Kowloon, Hong Kong
- Swiss Light Source, Paul Scherrer Institut, Villigen CH-5232, Switzerland
| | - C J Yi
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - S M Nie
- Department of Materials Science and Engineering, Stanford University, Stanford, California 94035, USA
| | - Y G Shi
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - A Tiwari
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
- Condensed Matter Theory Group, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - S S Tsirkin
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - T Neupert
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - M Medarde
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - M Shi
- Swiss Light Source, Paul Scherrer Institut, Villigen CH-5232, Switzerland
| | - J Chang
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - T Shang
- Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
- Key Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China
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25
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Ogunbunmi MO, Baranets S, Childs AB, Bobev S. The Zintl phases AIn 2As 2 (A = Ca, Sr, Ba): new topological insulators and thermoelectric material candidates. Dalton Trans 2021; 50:9173-9184. [PMID: 34121098 DOI: 10.1039/d1dt01521d] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Recently, there has been a lot of interest in topological insulators (TIs), being electronic materials, which are insulating in their bulk but with the gapless exotic metallic state on their surface. The surface states observed in such materials behave as a perfect conductor thereby making them more suited for several cutting-edge technological applications such as spintronic devices. Here, we report the synthesis and structural characterization of the Zintl phases AIn2As2 (A = Ca, Sr, Ba), which could become a new class of TIs. Crystal structure elucidation by single-crystal X-ray diffraction reveals that CaIn2As2 and SrIn2As2 are isostructural and crystallize in the EuIn2P2 structure type (space group P63/mmc, no. 194, Z = 2) with unit cell parameters a = 4.1482(6) Å, c = 17.726(4) Å; and a = 4.2222(6) Å, c = 18.110(3) Å, respectively. Their hexagonal structure is made up of alternating [In2As2]2- layers separated by slabs of A2+ cations. BaIn2As2 on the other hand crystallizes in the monoclinic EuGa2P2 structure type (space group P2/m, no. 10, Z = 4) with unit cell parameters a = 10.2746(11) Å, b = 4.3005(5) Å, c = 13.3317(14) Å and β = 95.569(2)°. This structure is also layered, and it is made up of different type of polyanionic [In2As2]2- units and Ba2+ cations. The valence electron count for all three compounds adheres to the Zintl-Klemm formalism, and all elements achieve closed-shell electronic configurations. Bulk electronic structure calculations indicate the opening of a bandgap Eg ∼ 0.03 eV (CaIn2As2 and Sr2In2As2), and Eg ∼0.21 eV (BaIn2As2) in the absence of strain and spin-orbit coupling (SOC). These results argue in favor of the realization of a nontrivial topological insulator state under the influence of tensile strain and SOC. Preliminary transport properties on BaIn2As2 are suggestive of a degenerate p-type semiconductor-a behavior which is sought after in thermoelectric (TE) materials. Since both TIs and excellent TE materials are known to favor the same material properties such as narrow bandgap, heavy elements, and strong SOC, these three Zintl phases are also projected as candidates TE materials.
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Affiliation(s)
- Michael O Ogunbunmi
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA.
| | - Sviatoslav Baranets
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA.
| | - Amanda B Childs
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA.
| | - Svilen Bobev
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA.
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26
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Xu L, Mao Y, Wang H, Li J, Chen Y, Xia Y, Li Y, Pei D, Zhang J, Zheng H, Huang K, Zhang C, Cui S, Liang A, Xia W, Su H, Jung S, Cacho C, Wang M, Li G, Xu Y, Guo Y, Yang L, Liu Z, Chen Y, Jiang M. Persistent surface states with diminishing gap in MnBi 2Te 4/Bi 2Te 3 superlattice antiferromagnetic topological insulator. Sci Bull (Beijing) 2020; 65:2086-2093. [PMID: 36732961 DOI: 10.1016/j.scib.2020.07.032] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Revised: 05/02/2020] [Accepted: 07/17/2020] [Indexed: 02/04/2023]
Abstract
Magnetic topological quantum materials (TQMs) provide a fertile ground for the emergence of fascinating topological magneto-electric effects. Recently, the discovery of intrinsic antiferromagnetic (AFM) topological insulator MnBi2Te4 that could realize quantized anomalous Hall effect and axion insulator phase ignited intensive study on this family of TQM compounds. Here, we investigated the AFM compound MnBi4Te7 where Bi2Te3 and MnBi2Te4 layers alternate to form a superlattice. Using spatial- and angle-resolved photoemission spectroscopy, we identified ubiquitous (albeit termination dependent) topological electronic structures from both Bi2Te3 and MnBi2Te4 terminations. Unexpectedly, while the bulk bands show strong temperature dependence correlated with the AFM transition, the topological surface states with a diminishing gap show negligible temperature dependence across the AFM transition. Together with the results of its sister compound MnBi2Te4, we illustrate important aspects of electronic structures and the effect of magnetic ordering in this family of magnetic TQMs.
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Affiliation(s)
- Lixuan Xu
- Center for Excellence in Superconducting Electronics, State Key Laboratory of Functional Material for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China; School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201210, China; ShanghaiTech Laboratory for Topological Physics, Shanghai 200031, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yuanhao Mao
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
| | - Hongyuan Wang
- School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201210, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jiaheng Li
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
| | - Yujie Chen
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
| | - Yunyouyou Xia
- School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201210, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yiwei Li
- Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, UK
| | - Ding Pei
- Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, UK
| | - Jing Zhang
- School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201210, China
| | - Huijun Zheng
- School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201210, China
| | - Kui Huang
- School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201210, China
| | - Chaofan Zhang
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
| | - Shengtao Cui
- School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201210, China
| | - Aiji Liang
- School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201210, China; ShanghaiTech Laboratory for Topological Physics, Shanghai 200031, China; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Wei Xia
- School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201210, China; ShanghaiTech Laboratory for Topological Physics, Shanghai 200031, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hao Su
- School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201210, China
| | - Sungwon Jung
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, UK
| | - Cephise Cacho
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, UK
| | - Meixiao Wang
- School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201210, China; ShanghaiTech Laboratory for Topological Physics, Shanghai 200031, China
| | - Gang Li
- School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201210, China; ShanghaiTech Laboratory for Topological Physics, Shanghai 200031, China
| | - Yong Xu
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China; Frontier Science Center for Quantum Information, Beijing 100084, China; RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
| | - Yanfeng Guo
- School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201210, China
| | - Lexian Yang
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China; Frontier Science Center for Quantum Information, Beijing 100084, China.
| | - Zhongkai Liu
- School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201210, China; ShanghaiTech Laboratory for Topological Physics, Shanghai 200031, China.
| | - Yulin Chen
- School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201210, China; ShanghaiTech Laboratory for Topological Physics, Shanghai 200031, China; State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China; Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, UK.
| | - Mianheng Jiang
- Center for Excellence in Superconducting Electronics, State Key Laboratory of Functional Material for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China; School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201210, China; University of Chinese Academy of Sciences, Beijing 100049, China
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27
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Chen L, Chang K. Chiral-Anomaly-Driven Casimir-Lifshitz Torque between Weyl Semimetals. PHYSICAL REVIEW LETTERS 2020; 125:047402. [PMID: 32794785 DOI: 10.1103/physrevlett.125.047402] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Accepted: 07/08/2020] [Indexed: 06/11/2023]
Abstract
We propose a new mechanism to generate the Casimir-Lifshitz torque between Weyl semimetals arising from the chiral anomaly. For short distances ranging from a nanometer to a few tens of nanometers, chiral anomaly is manifested via a Casimir-Lifshitz torque ∼sin(θ) with θ being the twisting angle. As the distance between Weyl semimetals increases from a submicrometer to a few micrometers, chiral-anomaly-driven Casimir-Lifshitz torque between Weyl semimetals is remarkably large, which is comparable with that of conventional birefringent materials.
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Affiliation(s)
- Liang Chen
- Mathematics and Physics Department, North China Electric Power University, Beijing 102206, China
| | - Kai Chang
- SKLSM, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083, China
- CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China
- Beijing Academy of Quantum Information Sciences, Beijing 100193, China
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Ma J, Wang H, Nie S, Yi C, Xu Y, Li H, Jandke J, Wulfhekel W, Huang Y, West D, Richard P, Chikina A, Strocov VN, Mesot J, Weng H, Zhang S, Shi Y, Qian T, Shi M, Ding H. Emergence of Nontrivial Low-Energy Dirac Fermions in Antiferromagnetic EuCd 2 As 2. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1907565. [PMID: 32091144 DOI: 10.1002/adma.201907565] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 01/20/2020] [Indexed: 06/10/2023]
Abstract
Parity-time symmetry plays an essential role for the formation of Dirac states in Dirac semimetals. So far, all of the experimentally identified topologically nontrivial Dirac semimetals (DSMs) possess both parity and time reversal symmetry. The realization of magnetic topological DSMs remains a major issue in topological material research. Here, combining angle-resolved photoemission spectroscopy with density functional theory calculations, it is ascertained that band inversion induces a topologically nontrivial ground state in EuCd2 As2 . As a result, ideal magnetic Dirac fermions with simplest double cone structure near the Fermi level emerge in the antiferromagnetic (AFM) phase. The magnetic order breaks time reversal symmetry, but preserves inversion symmetry. The double degeneracy of the Dirac bands is protected by a combination of inversion, time-reversal, and an additional translation operation. Moreover, the calculations show that a deviation of the magnetic moments from the c-axis leads to the breaking of C3 rotation symmetry, and thus, a small bandgap opens at the Dirac point in the bulk. In this case, the system hosts a novel state containing three different types of topological insulator: axion insulator, AFM topological crystalline insulator (TCI), and higher order topological insulator. The results provide an enlarged platform for the quest of topological Dirac fermions in a magnetic system.
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Affiliation(s)
- Junzhang Ma
- Paul Scherrer Institute, Swiss Light Source, CH-5232, Villigen, PSI, Switzerland
- Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne, CH-10 15, Lausanne, Switzerland
| | - Han Wang
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
| | - Simin Nie
- Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Changjiang Yi
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - Yuanfeng Xu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - Hang Li
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - Jasmin Jandke
- Paul Scherrer Institute, Swiss Light Source, CH-5232, Villigen, PSI, Switzerland
| | - Wulf Wulfhekel
- Physikalisches Institut, Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany
| | - Yaobo Huang
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, China
| | - Damien West
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
| | - Pierre Richard
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China
- Institut quantique, Université de Sherbrooke, 2500 boulevard de l'Université, Sherbrooke, Québec, J1K 2R1, Canada
| | - Alla Chikina
- Paul Scherrer Institute, Swiss Light Source, CH-5232, Villigen, PSI, Switzerland
| | - Vladimir N Strocov
- Paul Scherrer Institute, Swiss Light Source, CH-5232, Villigen, PSI, Switzerland
| | - Joël Mesot
- Paul Scherrer Institute, Swiss Light Source, CH-5232, Villigen, PSI, Switzerland
- Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne, CH-10 15, Lausanne, Switzerland
| | - Hongming Weng
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- Songshan Lake Materials Laboratory Dongguan, Guangdong, 523808, China
| | - Shengbai Zhang
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
| | - Youguo Shi
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- Songshan Lake Materials Laboratory Dongguan, Guangdong, 523808, China
| | - Tian Qian
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- Songshan Lake Materials Laboratory Dongguan, Guangdong, 523808, China
| | - Ming Shi
- Paul Scherrer Institute, Swiss Light Source, CH-5232, Villigen, PSI, Switzerland
| | - Hong Ding
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China
- Songshan Lake Materials Laboratory Dongguan, Guangdong, 523808, China
- CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing, 100190, China
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Sukhachov PO, Rostami H. Acoustogalvanic Effect in Dirac and Weyl Semimetals. PHYSICAL REVIEW LETTERS 2020; 124:126602. [PMID: 32281846 DOI: 10.1103/physrevlett.124.126602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Accepted: 03/03/2020] [Indexed: 06/11/2023]
Abstract
The acoustogalvanic effect is proposed as a nonlinear mechanism to generate a direct electric current by passing acoustic waves in Dirac and Weyl semimetals. Unlike the standard acoustoelectric effect, which relies on the sound-induced deformation potential and the corresponding electric field, the acoustogalvanic one originates from the pseudoelectromagnetic fields, which are not subject to screening. The longitudinal acoustogalvanic current scales at least quadratically with the relaxation time, which is in contrast to the photogalvanic current where the scaling is linear. Because of the interplay of pseudoelectric and pseudomagnetic fields, the current could show a nontrivial dependence on the direction of sound wave propagation. Being within the experimental reach, the effect can be utilized to probe dynamical deformations and corresponding pseudoelectromagnetic fields, which are yet to be experimentally observed in Weyl and Dirac semimetals.
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Affiliation(s)
- P O Sukhachov
- Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-106 91 Stockholm, Sweden
| | - H Rostami
- Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-106 91 Stockholm, Sweden
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