1
|
Barik RK, Mishra S, Khazaei M, Wang S, Liang Y, Sun Y, Ranjbar A, Tan TL, Wang J, Yunoki S, Ohno K, Kawazoe Y, Singh AK. Valley-Polarized Topological Phases with In-Plane Magnetization. NANO LETTERS 2024; 24:13213-13218. [PMID: 39377646 DOI: 10.1021/acs.nanolett.4c03252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/09/2024]
Abstract
The coexistence of valley polarization and topology has considerably facilitated the applications of 2D materials toward valleytronics device technology. However, isolated and distinct valleys are required to observe the valley-related quantum phenomenon. Herein, we report a new mechanism to generate in-plane magnetization direction-dependent isolated valley carriers by preserving or breaking the mirror symmetry in a 2D system. First-principle calculations are carried out on a prototype material, W2MnC2O2 MXene, to demonstrate the mechanism. A valley-coupled topological phase transition among Weyl semimetal, valley-polarized quantum anomalous Hall insulator, and topological semimetal is observed by manipulating the in-plane magnetization directions in W2MnC2O2. Monte Carlo simulations of W2MnC2O2 show that the estimated Curie temperature is around 170 K, indicating the possibility of observing valley-polarized topological states at higher temperatures. Our finding provides a generalized platform for investigating the valley and topological physics, which is extremely important for future quantum information processing applications.
Collapse
Affiliation(s)
- Ranjan Kumar Barik
- Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
| | - Subhendu Mishra
- Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
| | - Mohammad Khazaei
- Department of Physics, University of Tehran, North Kargar Ave., Tehran 14395-547, Iran
| | - Shiyao Wang
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, People's Republic of China
| | - Yunye Liang
- Department of Physics, Shanghai Normal University, Shanghai 200234, China
| | - Yan Sun
- Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
| | - Ahmad Ranjbar
- Dresden Center for Computational Materials Science (DCMS), Technische Universität Dresden, 01062 Dresden, Germany
| | - Teck Leong Tan
- Institute of High Performance Computing (IHPC), Agency for Science, Technology and Research (A*STAR), 1 Fusionopolis Way #16-16 Connexis, Singapore 138632, Singapore
| | - Junjie Wang
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, People's Republic of China
| | - Seiji Yunoki
- Computational Materials Science Research Team, RIKEN Center for Computational Science (R-CCS), Kobe, Hyogo 650-0047, Japan
| | - Kaoru Ohno
- Department of Physics, Yokohama National University, Yokohama 240-8501, Japan
| | - Yoshiyuki Kawazoe
- New Industry Creation Hatchery Center, Tohoku University, Sendai 980-8579, Japan
| | - Abhishek K Singh
- Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
| |
Collapse
|
2
|
Zhang W, Ding S, Zhang J, Cheng Z, Wu Z. A 2D low-buckled hexagonal honeycomb Weyl-point spin-gapless semiconductor family with the quantum anomalous Hall effect. NANOSCALE 2024; 16:17110-17117. [PMID: 39189678 DOI: 10.1039/d4nr00120f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/28/2024]
Abstract
Spin-gapless semiconductors (SGSs), serving as superior alternatives to half-metals, open up new avenues in spintronics. Specifically, Weyl-point SGSs (WPSGSs) with ideal Weyl points at the Fermi energy level represent an optimal amalgamation of spintronics and topological physics. Moreover, considering spin-orbital coupling (SOC), most two-dimensional (2D) WPSGSs undergo transformation into half Chern insulators (HCIs) with the emergence of the quantum anomalous Hall effect (QAHE). The 2D I-II-V half-Heusler compounds, constituting a broad family of narrow-bandgap semiconductors with low-buckled hexagonal honeycomb crystal structures akin to silicene, aptly function as SGSs and serve as nontrivial topological parent materials. Through first-principles calculations, we propose that the Li12X10Cr2Y12 (X = Mg, Zn, Cd; Y = P, As) monolayers, derived by substituting certain X atoms in the LiXY (X = Mg, Zn, Cd; Y = P, As) monolayers of I-II-V half-Heusler compounds with Cr atoms, emerge as potential candidates for ideal 2D WPSGSs. These monolayers exhibit stable thermodynamic properties and 100% spin polarization. With SOC taken into account, the Li12X10Cr2Y12 monolayers transition into HCIs with a Chern number of +1, giving rise to the QAHE. These intriguing findings lay the groundwork for a promising material platform for the development of low-power spintronic and topological microelectronic devices.
Collapse
Affiliation(s)
- Weihua Zhang
- School of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China.
| | - Shoubing Ding
- School of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China.
| | - Jie Zhang
- School of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China.
| | - Zhenxiang Cheng
- Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong 2500, Australia.
| | - Zhimin Wu
- School of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China.
| |
Collapse
|
3
|
Li W, Wang CM. An ideal candidate for observing anomalous Hall effect induced by the in-plane magnetic field. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2024; 36:205001. [PMID: 38335548 DOI: 10.1088/1361-648x/ad2804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Accepted: 02/09/2024] [Indexed: 02/12/2024]
Abstract
The anomalous Hall effect induced by the in-plane magnetic field (anomalous planar Hall effect) has recently attracted a lot of interests due to its numerous advantages. Although several schemes have been put forward in theory, experimental observations in many materials so far are often accompanied by planar Hall effects due to other mechanisms, rather than the pure anomalous planar Hall effect (APHE). We propose the surface state of the strained topological insulator as an ideal candidate to observe this effect. The surface state exhibits a pure APHE, characterized by a linear dependence on the magnetic field and a 2πperiodicity, which remains robust against the scattering of non-magnetic and various magnetic impurities, as long as the uniaxial strain preserves mirror symmetry. Although a general strain that breaks the mirror symmetry can induce the conventional Drude Hall effect, the anomalous contribution remains dominant. Furthermore, we present a feasible scheme to distinguish between the two contributions based on their distinct magnetic field dependencies. Our work is of great significance for promoting experimental observation of the APHE and provides reference value in the search for other realistic materials.
Collapse
Affiliation(s)
- Wenrong Li
- Department of Physics, Shanghai Normal University, Shanghai 200234, People's Republic of China
| | - C M Wang
- Department of Physics, Shanghai Normal University, Shanghai 200234, People's Republic of China
| |
Collapse
|
4
|
Zhang X, Wang X, He T, Wang L, Yu WW, Liu Y, Liu G, Cheng Z. Magnetic topological materials in two-dimensional: theory, material realization and application prospects. Sci Bull (Beijing) 2023; 68:2639-2657. [PMID: 37734982 DOI: 10.1016/j.scib.2023.09.004] [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: 04/28/2023] [Revised: 07/12/2023] [Accepted: 08/23/2023] [Indexed: 09/23/2023]
Abstract
Two-dimensional (2D) magnetism and nontrivial band topology are both areas of research that are currently receiving significant attention in the study of 2D materials. Recently, a novel class of materials has emerged, known as 2D magnetic topological materials, which elegantly combine 2D magnetism and nontrivial topology. This field has garnered increasing interest, especially due to the emergence of several novel magnetic topological states that have been generalized into the 2D scale. These states include antiferromagnetic topological insulators/semimetals, second-order topological insulators, and topological half-metals. Despite the rapid advancements in this emerging research field in recent years, there have been few comprehensive summaries of the state-of-the-art progress. Therefore, this review aims to provide a thorough analysis of current progress on 2D magnetic topological materials. We cover various 2D magnetic topological insulators, a range of 2D magnetic topological semimetals, and the novel 2D topological half-metals, systematically analyzing the basic topological theory, the course of development, the material realization, and potential applications. Finally, we discuss the challenges and prospects for 2D magnetic topological materials, highlighting the potential for future breakthroughs in this exciting field.
Collapse
Affiliation(s)
- Xiaoming Zhang
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, and School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Xiaotian Wang
- School of Physical Science and Technology, Southwest University, Chongqing 400715, China
| | - Tingli He
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, and School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Lirong Wang
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, and School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Wei-Wang Yu
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, and School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Ying Liu
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, and School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Guodong Liu
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, and School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China.
| | - Zhenxiang Cheng
- Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong 2500, Australia.
| |
Collapse
|
5
|
Liu G, Jiang H, Guo Z, Zhang X, Jin L, Liu C, Liu Y. Magnetic Second-Order Topological Insulators in 2H-Transition Metal Dichalcogenides. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2301952. [PMID: 37518836 PMCID: PMC10520633 DOI: 10.1002/advs.202301952] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2023] [Revised: 06/24/2023] [Indexed: 08/01/2023]
Abstract
The transition metal dichalcogenides, 2H-VX2 (X = S, Se, Te), are identified as two-dimensional second-order topological insulator (SOTI) with a ferromagnetic ground state by first-principles calculations. The 2H-VX2 (X = S, Se, Te) materials have a nontrivial band gap in two spin channels is found and exhibit topologically protected corner states with spin-polarization. These corner states only accommodate the quantized fractional charge (e/3). And the charge is bound at the corners of the nanodisk geometry 2H-VX2 (X = S, Se, Te) in real space. The corner states are robust against symmetry-breaking perturbations, which makes them more easily detectable in experiments. Further, it is demonstrated that the SOTI properties of 2H-VX2 (X = S, Se, Te) materials can be maintained in the presence of spin-orbit coupling and are stable against magnetization. Overall, the results reveal 2H-VX2 (X = S, Se, Te) as an ideal platform for the exploration of magnetic SOTI and suggest its great potential in experimental detection.
Collapse
Affiliation(s)
- Guodong Liu
- State Key Laboratory of Reliability and Intelligence of Electrical EquipmentHebei University of TechnologyTianjin300130China
- School of Materials Science and EngineeringHebei University of TechnologyTianjin300130China
| | - Haoqian Jiang
- State Key Laboratory of Reliability and Intelligence of Electrical EquipmentHebei University of TechnologyTianjin300130China
- School of Materials Science and EngineeringHebei University of TechnologyTianjin300130China
| | - Zhenzhou Guo
- State Key Laboratory of Reliability and Intelligence of Electrical EquipmentHebei University of TechnologyTianjin300130China
- School of Materials Science and EngineeringHebei University of TechnologyTianjin300130China
| | - Xiaoming Zhang
- State Key Laboratory of Reliability and Intelligence of Electrical EquipmentHebei University of TechnologyTianjin300130China
- School of Materials Science and EngineeringHebei University of TechnologyTianjin300130China
| | - Lei Jin
- State Key Laboratory of Reliability and Intelligence of Electrical EquipmentHebei University of TechnologyTianjin300130China
- School of Materials Science and EngineeringHebei University of TechnologyTianjin300130China
| | - Cong Liu
- State Key Laboratory of Reliability and Intelligence of Electrical EquipmentHebei University of TechnologyTianjin300130China
- School of Materials Science and EngineeringHebei University of TechnologyTianjin300130China
| | - Ying Liu
- State Key Laboratory of Reliability and Intelligence of Electrical EquipmentHebei University of TechnologyTianjin300130China
- School of Materials Science and EngineeringHebei University of TechnologyTianjin300130China
| |
Collapse
|
6
|
Zhang S, Zhang X, He Z, Jin L, Liu C, Liu Y, Liu G. Weyl nodal lines, Weyl points and the tunable quantum anomalous Hall effect in two-dimensional multiferroic metal oxynitride: Tl 2NO 2. NANOSCALE 2023; 15:14018-14024. [PMID: 37552024 DOI: 10.1039/d3nr01606d] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/09/2023]
Abstract
The investigation of two-dimensional (2D) multiferroic and topological quantum phases is a significant topic in current condensed matter physics. In this study, we discover quantum topological phases in the multiferroic material Tl2NO2. We observe that its ferroelectric (FE) phase displays a ferromagnetic ground state with magnetization favoring in-plane orientation. In the absence of spin-orbit coupling (SOC), a Weyl nodal loop around the Fermi level is evident, representing a 1D band crossing between spin-up and spin-down states. When spin-orbit coupling is taken into account, setting the magnetization in-plane, the Weyl nodal loop becomes gapped. Additionally, a pair of 2D Weyl nodes appear on the high-symmetry path, protected by a vertical mirror symmetry allowed by the magnetization. Remarkably, we prove that the Weyl nodes are situated at the topological phase transition between two quantum anomalous Hall (QAH) phases with opposite Chern numbers. Therefore, by adjusting the magnetization, it is possible to switch the propagation direction of chiral edge states. Furthermore, from its ferroelectric state to a paraelectric state, the time-reversal symmetry breaking nodal line is transformed into a Weyl point, achieving 100% spin polarization. Particularly, the Weyl points remain robust against SOC when the vertical mirror symmetry is preserved. Importantly, we also demonstrate that the Weyl point also represents the transition point where the QAH phase changes the sign of its Chern number. Overall, our study provides new insights into the study of multiferroic and topological phenomena in 2D materials and offers a potential avenue for controlling QAH phases.
Collapse
Affiliation(s)
- Shuo Zhang
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, and School of Materials Science and Engineering Hebei University of Technology, Tianjin 300130, China.
- Hebei Engineering Laboratory of Photoelectronic Functional Crystals, and School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Xiaoming Zhang
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, and School of Materials Science and Engineering Hebei University of Technology, Tianjin 300130, China.
- Hebei Engineering Laboratory of Photoelectronic Functional Crystals, and School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Zeqing He
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, and School of Materials Science and Engineering Hebei University of Technology, Tianjin 300130, China.
- Hebei Engineering Laboratory of Photoelectronic Functional Crystals, and School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Lei Jin
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, and School of Materials Science and Engineering Hebei University of Technology, Tianjin 300130, China.
- Hebei Engineering Laboratory of Photoelectronic Functional Crystals, and School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Cong Liu
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, and School of Materials Science and Engineering Hebei University of Technology, Tianjin 300130, China.
- Hebei Engineering Laboratory of Photoelectronic Functional Crystals, and School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Ying Liu
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, and School of Materials Science and Engineering Hebei University of Technology, Tianjin 300130, China.
- Hebei Engineering Laboratory of Photoelectronic Functional Crystals, and School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Guodong Liu
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, and School of Materials Science and Engineering Hebei University of Technology, Tianjin 300130, China.
- Hebei Engineering Laboratory of Photoelectronic Functional Crystals, and School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| |
Collapse
|
7
|
Zhang D, Wang K, Chen S, Zhang L, Ni Y, Zhang G. Regulating the thermal conductivity of monolayer MnPS 3 by a magnetic phase transition. NANOSCALE 2023; 15:1180-1185. [PMID: 36524588 DOI: 10.1039/d2nr04709h] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
In this study, based on ab initio calculations and the phonon Boltzmann transport equation, we found that magnetic phase transitions can lead to a significant change in the thermal conductivity of monolayer MnPS3. Around the Néel temperature (78 K) with the antiferromagnetic-paramagnetic (AFM-PM) phase transition, its thermal conductivity increases from 14.89 W mK-1 (AFM phase) to 103.21 W mK-1 (PM phase). Below 78 K, the thermal conductivity of monolayer MnPS3 can be doubled by applying a magnetic field of 4 T, this value has been reported in a previous experiment for the antiferromagnetic-ferromagnetic (AFM-FM) phase transition. Above 78 K, the thermal conductivity of PM phase can be greatly reduced through the PM-AFM magnetic phase transition. In addition to the value of thermal conductivity, the relative contribution ratio between acoustic and optical modes changes with different magnetic phases. The subsequent analyses demonstrate that this regulation originates from the change in lattice parameter, bonding interaction and phonon anharmonicity. In addition, the different effect on the thermal conductivity between the FM and AFM phases was identified by comparing the corresponding phonon scattering characteristics. This study should shed light on the understanding of phonon thermal conductivity in 2D magnets, and provide a practical method for the realization of 2D thermal switching devices, which would enable a broad range of novel applications including energy conversion and thermal management.
Collapse
Affiliation(s)
- Dingbo Zhang
- School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, China.
- Institute of High Performance Computing, A*STAR, 138632, Singapore.
| | - Ke Wang
- School of Automation, Xi'an University of Posts & Telecommunications, Shaanxi, 710121, China
| | - Shuai Chen
- Institute of High Performance Computing, A*STAR, 138632, Singapore.
| | - Lifa Zhang
- NNU-SULI Thermal Energy Research Center, and Center for Quantum Transport and Thermal Energy Science (CQTES), School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China
| | - Yuxiang Ni
- School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, China.
| | - Gang Zhang
- Institute of High Performance Computing, A*STAR, 138632, Singapore.
| |
Collapse
|
8
|
Ding G, SUN T, Surucu G, Surucu O, Gencer A, Wang X. Complex nodal structure phonons formed by open and closed nodal lines in CoAsS and Na2CuP solids. Phys Chem Chem Phys 2022; 24:17210-17216. [DOI: 10.1039/d2cp01992b] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Topological phononic states with nodal lines have not only updated our knowledge of the phases of matter in a fundamental way, they have also become a major frontier research direction...
Collapse
|
9
|
Zhang L, Fang F, Cheng L, Lin H, Wang K. Obvious Surface States Connecting to the Projected Triple Points in NaCl's Phonon Dispersion. Front Chem 2021; 9:789522. [PMID: 34869236 PMCID: PMC8634720 DOI: 10.3389/fchem.2021.789522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 10/18/2021] [Indexed: 12/03/2022] Open
Abstract
With the development of computer technology and theoretical chemistry, the speed and accuracy of first-principles calculations have significantly improved. Using first-principles calculations to predict new topological materials is a hot research topic in theoretical and computational chemistry. In this work, we focus on a well-known material, sodium chloride (NaCl), and propose that the triple point (TP), quadratic contact triple point (QCTP), linear and quadratic nodal lines can be found in the phonon dispersion of NaCl with Fm3¯ m type structure. More importantly, we propose that the clear surface states connected to the projected TP and QCTP are visible on the (001) surface. It is hoped that further experimental investigation and verification for these properties as mentioned above.
Collapse
Affiliation(s)
- Li Zhang
- 'College of Mechanics, Changchun Institute of Technology, Changchun, China
| | - Fang Fang
- Engineering and Technology Center, The Fourth Medical College of Harbin Medical University, Harbin, China
| | - Lixin Cheng
- Engineering and Technology Center, The Fourth Medical College of Harbin Medical University, Harbin, China
| | - Huiming Lin
- School of Chemistry, Harbin Normal University, Harbin, China
| | - Kai Wang
- Engineering and Technology Center, The Fourth Medical College of Harbin Medical University, Harbin, China
| |
Collapse
|