Quantum spin Hall state in monolayer 1T’-WTe2

Title
Quantum spin Hall state in monolayer 1T’-WTe2
Authors
류혜진Shujie TangChaofan ZhangDillon WongZahra PedramraziHsin-Zon TsaiChunjing JiaBrian MoritzMartin ClaassenSalman KahnJuan JiangHao YanMakoto HashimotoDonghui LuRobert G. MooreChan-Cuk HwangChoongyu HwangZahid HussainYulin ChenMiguel M. UgedaZhi LiuXiaoming XieThomas P. DevereauxMichael F. CrommieSung-Kwan MoZhi-Xun Shen
Issue Date
2017-07
Publisher
Nature physics
Citation
VOL 13-688
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 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).
URI
http://pubs.kist.re.kr/handle/201004/70273
ISSN
1745-2473
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