Quantum spin Hall state in monolayer 1T'-WTe2
Shujie Tang,Chaofan Zhang,Chaofan Zhang,Dillon Wong,Zahra Pedramrazi,Hsin-Zon Tsai,Chunjing Jia,Chunjing Jia,Brian Moritz,Martin Claassen,Hyejin Ryu,Hyejin Ryu,Hyejin Ryu,Salman Kahn,Juan Jiang,Juan Jiang,Juan Jiang,Hao Yan,Hao Yan,Makoto Hashimoto,Donghui Lu,Robert G. Moore,Robert G. Moore,Chan-Cuk Hwang,Choongyu Hwang,Zahid Hussain,Yulin Chen,Miguel M. Ugeda,Zhi Liu,Zhi Liu,Xiaoming Xie,Xiaoming Xie,Thomas P. Devereaux,Thomas P. Devereaux,Michael F. Crommie,Michael F. Crommie,Sung-Kwan Mo,Zhi-Xun Shen,Zhi-Xun Shen +38 more
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TLDR
A combination of photoemission and scanning tunnelling spectroscopy measurements provide compelling evidence that single layers of 1T'-WTe2 are a class of quantum spin Hall insulator as mentioned in this paper.Abstract:
A combination of photoemission and scanning tunnelling spectroscopy measurements provide compelling evidence that single layers of 1T'-WTe2 are a class of quantum spin Hall insulator. A quantum spin Hall (QSH) insulator is a novel two-dimensional quantum state of matter that features quantized Hall conductance in the absence of a magnetic field, resulting from topologically protected dissipationless edge states that bridge the energy gap opened by band inversion and strong spin–orbit coupling1,2. By investigating the electronic structure of epitaxially grown monolayer 1T'-WTe2 using angle-resolved photoemission (ARPES) and first-principles calculations, we observe clear signatures of topological band inversion and bandgap opening, which are the hallmarks of a QSH state. Scanning tunnelling microscopy measurements further confirm the correct crystal structure and the existence of a bulk bandgap, and provide evidence for a modified electronic structure near the edge that is consistent with the expectations for a QSH insulator. Our results establish monolayer 1T'-WTe2 as a new class of QSH insulator with large bandgap in a robust two-dimensional materials family of transition metal dichalcogenides (TMDCs).read more
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Observation of the quantum spin Hall effect up to 100 kelvin in a monolayer crystal
Sanfeng Wu,Valla Fatemi,Quinn Gibson,Kenji Watanabe,Takashi Taniguchi,Robert J. Cava,Pablo Jarillo-Herrero +6 more
TL;DR: The QSHE is established in monolayer tungsten ditelluride (WTe2) at temperatures much higher than in semiconductor heterostructures and allow for exploring topological phases in atomically thin crystals.
Journal ArticleDOI
Towards properties on demand in quantum materials
TL;DR: Emerging strategies for selectively perturbing microscopic interaction parameters are described, which can be used to transform materials into a desired quantum state and outline a potential roadmap to an era of quantum phenomena on demand.
Journal ArticleDOI
Ferroelectric switching of a two-dimensional metal
Zaiyao Fei,Wenjin Zhao,Tauno Palomaki,Bosong Sun,Moira Miller,Zhiying Zhao,Zhiying Zhao,Jiaqiang Yan,Xiaodong Xu,David Cobden +9 more
TL;DR: In this paper, the topological semimetal WTe2 provides an embodiment of this principle, showing that two- or three-layer Wte2 exhibits spontaneous out-of-plane electric polarization that can be switched using gate electrodes.
Journal ArticleDOI
Observation of the nonlinear Hall effect under time-reversal-symmetric conditions
Qiong Ma,Su-Yang Xu,Huitao Shen,David MacNeill,Valla Fatemi,Tay-Rong Chang,Andrés M. Mier Valdivia,Sanfeng Wu,Z. Z. Du,Z. Z. Du,Chuang-Han Hsu,Shiang Fang,Quinn Gibson,Kenji Watanabe,Takashi Taniguchi,Robert J. Cava,Efthimios Kaxiras,Hai-Zhou Lu,Hsin Lin,Liang Fu,Nuh Gedik,Pablo Jarillo-Herrero +21 more
TL;DR: The nonlinear Hall effect is observed in bilayer WTe2 in the absence of a magnetic field, providing a direct measure of the dipole moment of the Berry curvature, which arises from layer-polarized Dirac fermions in bilayers WTe 2 under time-reversal-symmetric conditions.
Journal ArticleDOI
Nonlinear anomalous Hall effect in few-layer WTe 2
TL;DR: A nonlinear anomalous Hall effect, allowed for certain point group symmetries, is observed in metallic WTe2, and can be understood as an AHE induced by the bias current, which generates an out-of-plane magnetization.
References
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Journal ArticleDOI
Colloquium: Topological insulators
M. Z. Hasan,Charles L. Kane +1 more
TL;DR: In this paper, the theoretical foundation for topological insulators and superconductors is reviewed and recent experiments are described in which the signatures of topologically insulators have been observed.
Journal ArticleDOI
Quantum spin Hall effect in graphene
Charles L. Kane,Eugene J. Mele +1 more
TL;DR: Graphene is converted from an ideal two-dimensional semimetallic state to a quantum spin Hall insulator and the spin and charge conductances in these edge states are calculated and the effects of temperature, chemical potential, Rashba coupling, disorder, and symmetry breaking fields are discussed.
Journal ArticleDOI
Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
TL;DR: In this article, the quantum spin Hall (QSH) effect can be realized in mercury-cadmium telluride semiconductor quantum wells, a state of matter with topological properties distinct from those of conventional insulators.
Journal ArticleDOI
Quantum Spin Hall Insulator State in HgTe Quantum Wells
Markus König,Steffen Wiedmann,Steffen Wiedmann,Christoph Brüne,Christoph Brüne,Andreas Roth,Andreas Roth,Hartmut Buhmann,Hartmut Buhmann,Laurens W. Molenkamp,Laurens W. Molenkamp,Xiao-Liang Qi,Xiao-Liang Qi,Shou-Cheng Zhang,Shou-Cheng Zhang +14 more
TL;DR: The quantum phase transition at the critical thickness, d = 6.3 nanometers, was independently determined from the magnetic field–induced insulator-to-metal transition, providing experimental evidence of the quantum spin Hall effect.
Journal ArticleDOI
Topological insulators with inversion symmetry
Liang Fu,Charles L. Kane +1 more
TL;DR: In this paper, it was shown that the parity of the occupied Bloch wave functions at the time-reversal invariant points in the Brillouin zone greatly simplifies the problem of evaluating the topological invariants.