Quantum Spin Hall States and Topological Phase Transition in Germanene
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- Pantelis Bampoulis
- Physics of Interfaces and Nanomaterials, MESA+ Institute, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, Netherlands
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- Carolien Castenmiller
- Physics of Interfaces and Nanomaterials, MESA+ Institute, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, Netherlands
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- Dennis J. Klaassen
- Physics of Interfaces and Nanomaterials, MESA+ Institute, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, Netherlands
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- Jelle van Mil
- Physics of Interfaces and Nanomaterials, MESA+ Institute, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, Netherlands
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- Yichen Liu
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China
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- Cheng-Cheng Liu
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China
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- 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
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- Motohiko Ezawa
- Department of Applied Physics, University of Tokyo, Hongo, 113-8656 Tokyo, Japan
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- Alexander N. Rudenko
- Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ Nijmegen, Netherlands
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- Harold J. W. Zandvliet
- Physics of Interfaces and Nanomaterials, MESA+ Institute, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, Netherlands
書誌事項
- 公開日
- 2023-05-12
- 権利情報
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- https://link.aps.org/licenses/aps-default-license
- https://link.aps.org/licenses/aps-default-accepted-manuscript-license
- DOI
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- 10.1103/physrevlett.130.196401
- 10.21203/rs.3.rs-2135721/v1
- 公開者
- American Physical Society (APS)
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説明
<jats:title>Abstract</jats:title> <jats:p>The realization of the topological field-effect transistor requires an electric field-induced transition from a topological state with dissipationless conductive channels (`On') to a trivial insulator state (`Off'). Monoelemental and buckled quantum spin Hall insulators with large topological band gaps are ideal candidates to investigate topological phase transitions. We provide compelling experimental evidence that low-buckled epitaxial germanene is a quantum spin Hall insulator with a large bulk gap and robust metallic edge states. The low-buckled structure of germanene allows for topological phase transitions to take place. Upon the application of a critical transversal electric field, the topological gap closes and germanene becomes a Dirac semimetal. Increasing the electric field further results in opening of a trivial gap and disappearance of the edge states. This reversible electric field-induced switching of the topological state and the sizeable gap make germanene suitable for room-temperature topological field-effect transistors, which could revolutionize low-energy electronics and spintronics.</jats:p>
収録刊行物
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- Physical Review Letters
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Physical Review Letters 130 (19), 196401-, 2023-05-12
American Physical Society (APS)