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Lin MK, Hlevyack JA, Zhao C, Dudin P, Avila J, Mo SK, Cheng CM, Abbamonte P, Shoemaker DP, Chiang TC. Unconventional Spectral Gaps Induced by Charge Density Waves in the Weyl Semimetal (TaSe 4) 2I. NANO LETTERS 2024; 24:8778-8783. [PMID: 38976362 PMCID: PMC11261618 DOI: 10.1021/acs.nanolett.4c02701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2024] [Revised: 07/02/2024] [Accepted: 07/02/2024] [Indexed: 07/10/2024]
Abstract
Coupling Weyl quasiparticles and charge density waves (CDWs) can lead to fascinating band renormalization and many-body effects beyond band folding and Peierls gaps. For the quasi-one-dimensional chiral compound (TaSe4)2I with an incommensurate CDW transition at TC = 263 K, photoemission mappings thus far are intriguing due to suppressed emission near the Fermi level. Models for this unconventional behavior include axion insulator phases, correlation pseudogaps, polaron subbands, bipolaron bound states, etc. Our photoemission measurements show sharp quasiparticle bands crossing the Fermi level at T > TC, but for T < TC, these bands retain their dispersions with no Peierls or axion gaps at the Weyl points. Instead, occupied band edges recede from the Fermi level, opening a spectral gap. Our results confirm localization of quasiparticles (holes created by photoemission) is the key physics, which suppresses spectral weights over an energy window governed by incommensurate modulation and inherent phase defects of CDW.
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Affiliation(s)
- Meng-Kai Lin
- Department
of Physics, National Central University, Taoyuan 32001, Taiwan
| | - Joseph Andrew Hlevyack
- Department
of Physics, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Chengxi Zhao
- Department
of Materials Science and Engineering, University
of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Pavel Dudin
- Synchrotron
SOLEIL and Universite Paris-Saclay, L’Orme des Merisiers, BP48, 91190 Saint-Aubin, France
| | - José Avila
- Synchrotron
SOLEIL and Universite Paris-Saclay, L’Orme des Merisiers, BP48, 91190 Saint-Aubin, France
| | - Sung-Kwan Mo
- Advanced
Light Source, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
| | - Cheng-Maw Cheng
- National
Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Peter Abbamonte
- Department
of Physics, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Daniel P. Shoemaker
- Department
of Materials Science and Engineering, University
of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Tai-Chang Chiang
- Department
of Physics, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
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Li J, Li Q, Mi J, Xu Z, Xie Y, Tang W, Zhu H, Li L, Tong L. Ultrabroadband High Photoresponsivity at Room Temperature Based on Quasi-1D Pseudogap System (TaSe 4 ) 2 I. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2302886. [PMID: 38064179 PMCID: PMC10870056 DOI: 10.1002/advs.202302886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Revised: 11/21/2023] [Indexed: 02/17/2024]
Abstract
Narrow bandgap materials have garnered significant attention within the field of broadband photodetection. However, the performance is impeded by diminished absorption near the bandgap, resulting in a rapid decline in photoresponsivity within the mid-wave infrared (MWIR) and long-wave infrared (LWIR) regions. Furthermore, they mostly worked in cryogenic temperature. Here, without the assistance of any complex structure and special environment, it is realized high responsivity covering ultra-broadband wavelength range (Ultraviolet (UV) to LWIR) in a single quasi-1D pseudogap (PG) system (TaSe4 )2 I nanoribbon, especially high responsivity (From 23.9 to 8.31 A W-1 ) within MWIR and LWIR region at room temperature (RT). Through direct probing the carrier relaxation process with broadband time-resolved transient absorption spectrum measurement, the underlying mechanism of majorly photoconductive effect is revealed, which causes an increased spectral weight extended to PG region. This work paves the way for realizing high-performance uncooled MWIR and LWIR detection by using quasi-1D PG materials.
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Affiliation(s)
- Jialin Li
- State Key Laboratory of Modern Optical InstrumentationCollege of Optical Science and EngineeringZhejiang UniversityHangzhou310027China
- Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou310024China
| | - Qing Li
- Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou310024China
| | - Junjian Mi
- Zhejiang Province Key Laboratory of Quantum Technology and DeviceDepartment of PhysicsZhejiang UniversityHangzhou310027China
| | - Zhuan Xu
- Zhejiang Province Key Laboratory of Quantum Technology and DeviceDepartment of PhysicsZhejiang UniversityHangzhou310027China
| | - Yu Xie
- Research Center for Humanoid SensingZhejiang LabHangzhou311100China
| | - Wei Tang
- State Key Laboratory of Modern Optical InstrumentationCollege of Optical Science and EngineeringZhejiang UniversityHangzhou310027China
| | - Huanfeng Zhu
- State Key Laboratory of Modern Optical InstrumentationCollege of Optical Science and EngineeringZhejiang UniversityHangzhou310027China
- Intelligent Optics and Photonics Research CenterJiaxing Research Institute Zhejiang UniversityJiaxing314000China
- Jiaxing Key Laboratory of Photonic Sensing and Intelligent ImagingJiaxing Institute Zhejiang UniversityJiaxing314000China
| | - Linjun Li
- State Key Laboratory of Modern Optical InstrumentationCollege of Optical Science and EngineeringZhejiang UniversityHangzhou310027China
- Intelligent Optics and Photonics Research CenterJiaxing Research Institute Zhejiang UniversityJiaxing314000China
- Jiaxing Key Laboratory of Photonic Sensing and Intelligent ImagingJiaxing Institute Zhejiang UniversityJiaxing314000China
| | - Limin Tong
- State Key Laboratory of Modern Optical InstrumentationCollege of Optical Science and EngineeringZhejiang UniversityHangzhou310027China
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Cheng B, Cheng D, Jiang T, Xia W, Song B, Mootz M, Luo L, Perakis IE, Yao Y, Guo Y, Wang J. Chirality manipulation of ultrafast phase switches in a correlated CDW-Weyl semimetal. Nat Commun 2024; 15:785. [PMID: 38278821 PMCID: PMC10817907 DOI: 10.1038/s41467-024-45036-1] [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: 09/07/2023] [Accepted: 01/11/2024] [Indexed: 01/28/2024] Open
Abstract
Light engineering of correlated states in topological materials provides a new avenue of achieving exotic topological phases inaccessible by conventional tuning methods. Here we demonstrate a light control of correlation gaps in a model charge-density-wave (CDW) and polaron insulator (TaSe4)2I recently predicted to be an axion insulator. Our ultrafast terahertz photocurrent spectroscopy reveals a two-step, non-thermal melting of polarons and electronic CDW gap via the fluence dependence of a longitudinal circular photogalvanic current. This helicity-dependent photocurrent reveals continuous ultrafast phase switches from the polaronic state to the CDW (axion) phase, and finally to a hidden Weyl phase as the pump fluence increases. Additional distinctive attributes aligning with the light-induced switches include: the mode-selective coupling of coherent phonons to the polaron and CDW modulation, and the emergence of a non-thermal chiral photocurrent above the pump threshold of CDW-related phonons. The demonstrated ultrafast chirality control of correlated topological states here holds large potentials for realizing axion electrodynamics and advancing quantum-computing applications.
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Affiliation(s)
- Bing Cheng
- Ames National Laboratory, Ames, IA, 50011, USA.
| | - Di Cheng
- Ames National Laboratory, Ames, IA, 50011, USA
| | - Tao Jiang
- Ames National Laboratory, Ames, IA, 50011, USA
| | - Wei Xia
- School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China
- ShanghaiTech Laboratory for Topological Physics, Shanghai, 201210, China
| | - Boqun Song
- Ames National Laboratory, Ames, IA, 50011, USA
- Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA
| | - Martin Mootz
- Ames National Laboratory, Ames, IA, 50011, USA
- Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA
| | - Liang Luo
- Ames National Laboratory, Ames, IA, 50011, USA
| | - Ilias E Perakis
- Department of Physics, University of Alabama at Birmingham, Birmingham, AL, 35294-1170, USA
| | - Yongxin Yao
- Ames National Laboratory, Ames, IA, 50011, USA
| | - Yanfeng Guo
- School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China
- ShanghaiTech Laboratory for Topological Physics, Shanghai, 201210, China
| | - Jigang Wang
- Ames National Laboratory, Ames, IA, 50011, USA.
- Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA.
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