Skip to main content
eScholarship
Open Access Publications from the University of California

Quantum spin Hall state in monolayer 1T'-WTe2

  • 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'-WTe2using 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'-WTe2as a new class of QSH insulator with large bandgap in a robust two-dimensional materials family of transition metal dichalcogenides (TMDCs).

Many UC-authored scholarly publications are freely available on this site because of the UC Academic Senate's Open Access Policy. Let us know how this access is important for you.

Main Content
Current View