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Título: | Observation of topologically protected states at crystalline phase boundaries in single-layer WSe2 |
Autor: | Ugeda, Miguel M. CSIC ORCID CVN; Pulkin, Artem; Tang, Shujie; Ryu, Hyejin; Wu, Quansheng; Zhang, Yi; Wong, Dillon; Pedramrazi, Zahra; Martín-Recio, Ana; Chen, Yi; Wang, Feng; Shen, Zhi-Xun; Mo, Sung-Kwan; Yazyev, Oleg V.; Crommie, Michael F. | Fecha de publicación: | 2018 | Editor: | Nature Publishing Group | Citación: | Nature Communications 9(1): 3401 (2018) | Resumen: | 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. | Versión del editor: | https://doi.org/10.1038/s41467-018-05672-w | URI: | http://hdl.handle.net/10261/178193 | DOI: | 10.1038/s41467-018-05672-w | E-ISSN: | 2041-1723 |
Aparece en las colecciones: | (CFM) Artículos |
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observaWSe2.pdf | 2,87 MB | Adobe PDF | Visualizar/Abrir |
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