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Quantum spin Hall state in monolayer 1T'-WTe 2

  • Author(s): Tang, S
  • Zhang, C
  • Wong, D
  • Pedramrazi, Z
  • Tsai, HZ
  • Jia, C
  • Moritz, B
  • Claassen, M
  • Ryu, H
  • Kahn, S
  • Jiang, J
  • Yan, H
  • Hashimoto, M
  • Lu, D
  • Moore, RG
  • Hwang, CC
  • Hwang, C
  • Hussain, Z
  • Chen, Y
  • Ugeda, MM
  • Liu, Z
  • Xie, X
  • Devereaux, TP
  • Crommie, MF
  • Mo, SK
  • Shen, ZX
  • et al.

Published Web Location

https://doi.org/10.1038/nphys4174
Abstract

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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