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), 1
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Abstract T ′-WSe2. We observe edge states at the crystallographically aligned interface between a quantum spin Hall insulating domain of 1T ′-WSe2and a semiconducting domain of 1H -WSe2in contiguous single layers. The QSHI nature of single-layer 1T ′-WSe2is 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. -
Sun, Qiming ; Zhang, Xing ; Banerjee, Samragni ; Bao, Peng ; Barbry, Marc ; Blunt, Nick S. ; Bogdanov, Nikolay A. ; Booth, George H. ; Chen, Jia ; Cui, Zhi-Hao ; et al ( , The Journal of Chemical Physics)