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Quantum spin Hall state in monolayer 1T'-WTe2
- Tang, Shujie;
- Zhang, Chaofan;
- Wong, Dillon;
- Pedramrazi, Zahra;
- Tsai, Hsin-Zon;
- Jia, Chunjing;
- Moritz, Brian;
- Claassen, Martin;
- Ryu, Hyejin;
- Kahn, Salman;
- Jiang, Juan;
- Yan, Hao;
- Hashimoto, Makoto;
- Lu, Donghui;
- Moore, Robert G;
- Hwang, Chan-Cuk;
- Hwang, Choongyu;
- Hussain, Zahid;
- Chen, Yulin;
- Ugeda, Miguel M;
- Liu, Zhi;
- Xie, Xiaoming;
- Devereaux, Thomas P;
- Crommie, Michael F;
- Mo, Sung-Kwan;
- Shen, Zhi-Xun
Published Web Location
https://doi.org/10.1038/nphys4174Abstract
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 coupling. By investigating the electronic structure of epitaxially grown monolayer 1T'-WTe 2 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'-WTe 2 as a new class of QSH insulator with large bandgap in a robust two-dimensional materials family of transition metal dichalcogenides (TMDCs).
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