Journal
NATURE PHYSICS
Volume 13, Issue 7, Pages 683-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS4174
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Funding
- Office of Basic Energy Sciences, Division of Materials Science
- AFOSR through the University of Washington [FA9550-14-1-0277]
- Office of Basic Energy Sciences, US DOE [DE-AC02-05CH11231, DE-AC02-76SF00515]
- VdW Heterostructure Program - Office of Basic Energy Sciences, US DOE [DE-AC02-05CH11231, KCWF16]
- National Science Foundation [EFMA-1542741]
- National Natural Science Foundation of China [11227902]
- CPSF-CAS Joint Foundation for Excellent Postdoctoral Fellows
- NRF, Korea [2011-0030787, 2017R1A2B2003928]
- NRF, Korea through Max Planck Korea/POSTECH Research Initiative [2011-0031558]
- Basic Science Research Program [2015R1C1A1A01053065]
- Spanish MINECO [MAT2014-60996-R]
- US Department of Energy, Office of Science [DE-AC02-05CH11231]
- National Research Foundation of Korea [2011-0030046, 2017R1A2B2003928, 2011-0031558, 21A20151213022, 2015R1C1A1A01053065] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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(1,2). 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).
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