Observation of Topologically Protected States at Crystalline Phase Boundaries in Single-layer WSe2

Title
Observation of Topologically Protected States at Crystalline Phase Boundaries in Single-layer WSe2
Authors
류혜진Miguel M. UgedaArtem PulkinShujie TangQuansheng WuYi ZhangDillon WongZahra PedramraziAna Martin-RecioYi ChenFeng WangZhi-Xun ShenSung-Kwan MoOleg V. YazyevMichael F. Crommie
Issue Date
2018-08
Publisher
Nature Communications
Citation
VOL 9, 3401
Abstract
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 twodimensional 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.
URI
http://pubs.kist.re.kr/handle/201004/70309
ISSN
2041-1723
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KIST Publication > Article
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