Observation of topologically protected states at crystalline phase boundaries in single-layer WSe2

Miguel M. Ugeda (), Artem Pulkin, Shujie Tang, Hyejin Ryu, Quansheng Wu, Yi Zhang, Dillon Wong, Zahra Pedramrazi, Ana Martín-Recio, Yi Chen, Feng Wang, Zhi-Xun Shen, Sung-Kwan Mo, Oleg V. Yazyev and Michael F. Crommie ()
Additional contact information
Miguel M. Ugeda: Donostia International Physics Center (DIPC)
Artem Pulkin: Ecole Polytechnique Fédérale de Lausanne (EPFL)
Shujie Tang: Advanced Light Source, Lawrence Berkeley National Laboratory
Hyejin Ryu: Advanced Light Source, Lawrence Berkeley National Laboratory
Quansheng Wu: Ecole Polytechnique Fédérale de Lausanne (EPFL)
Yi Zhang: Advanced Light Source, Lawrence Berkeley National Laboratory
Dillon Wong: University of California at Berkeley
Zahra Pedramrazi: University of California at Berkeley
Ana Martín-Recio: University of California at Berkeley
Yi Chen: University of California at Berkeley
Feng Wang: University of California at Berkeley
Zhi-Xun Shen: SLAC National Accelerator Laboratory
Sung-Kwan Mo: Advanced Light Source, Lawrence Berkeley National Laboratory
Oleg V. Yazyev: Ecole Polytechnique Fédérale de Lausanne (EPFL)
Michael F. Crommie: University of California at Berkeley

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: 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 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.

Date: 2018
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DOI: 10.1038/s41467-018-05672-w

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