期刊
NATURE COMMUNICATIONS
卷 9, 期 -, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-018-05672-w
关键词
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资金
- VdW Heterostructure program - Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, of the US Department of Energy [KCWF16, DE-AC02-05CH11231]
- National Science Foundation [EFMA-1542741]
- Office of Basic Energy Sciences, US DOE [DE-AC02-05CH11231, DE-AC02-76SF00515]
- CPSF-CAS Joint Foundation for Excellent Postdoctoral Fellows
- NRF, Korea through Max Planck Korea/POSTECH Research Initiatives [2016K1A4A4A01922028, 2011-0031558]
- ERC Starting grant TopoMat [306504]
- NCCR Marvel
- Swiss National Supercomputing Centre (CSCS) [s832]
- Fundamental Research Funds for the Central Universities [020414380037]
- DOE BES, Division of Materials Sciences
- Spanish MINECO [MAT2017-88377-C2-1-R]
Transition metal dichalcogenide materials are unique in the wide variety of structural and electronic phases they exhibit in the two-dimensional limit. Here we show how such polymorphic flexibility can be used to achieve topological states at highly ordered phase boundaries in a new quantum spin Hall insulator (QSHI), 1T'-WSe2. We observe edge states at the crystallographically aligned interface between a quantum spin Hall insulating domain of 1T'-WSe2 and a semiconducting domain of 1H-WSe2 in contiguous single layers. The QSHI nature of single-layer 1T'-WSe2 is verified using angle-resolved photoemission spectroscopy to determine band inversion around a 120 meV energy gap, as well as scanning tunneling spectroscopy to directly image edge-state formation. Using this edge-state geometry we confirm the predicted penetration depth of one-dimensional interface states into the two-dimensional bulk of a QSHI for a well-specified crystallographic direction. These interfaces create opportunities for testing predictions of the microscopic behavior of topologically protected boundary states.
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