Exploring the Electonic Properties of Strain-induced Grain Boundaries in the 2D Quantum Spin Hall State in 1T’-WSe<sub>2</sub>

ORAL

Abstract

Monolayer group VI transition metal dichalcogenides (MX2 group, where M is W or Mo and X is S, Se or Te) host novel electronic phases including a 2D quantum spin Hall (QSH) state in the 1T’ structure. The 1T’ phase has three orientational variants. Using scanning tunneling microscopy, we induce strain on monolayer 1T’-WSe2 islands, which results in switching between these three orientations and creates grain boundaries between two topologically nontrivial 1T’ domains. The electronic structure of these grain boundaries is then explored via scanning tunneling spectroscopy and compared with calculations of confined electronic modes on the grain boundary.

*National Science Foundation (NSF)
United States Department of Energy (DOE)

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Presenters

  • Zahra Pedramrazi

    • UCB
    • Univ of California - Berkeley

Authors

  • Zahra Pedramrazi

    • UCB
    • Univ of California - Berkeley

  • Charlotte Herbig

    • Univ of California - Berkeley

  • Madeleine Philips

    • University of Pennsylvania

  • Dillon Wong

    • Princeton University
    • Joseph Henry Laboratories & Department of Physics, Princeton University
    • UCB
    • Physics, Princeton University
    • Univ of California - Berkeley

  • Yi Chen

    • Univ of California - Berkeley

  • Hsin-Zon Tsai

    • Physics, Univ of California - Berkeley
    • Univ of California - Berkeley
    • UCB
    • Physics, UC Berkeley
    • Physics, University of California, Berkeley
    • Department of physics, University of California - Berkeley

  • Shujie Tang

    • Stanford University
    • Lawrence Berkeley National Laboratory
    • SIMIS, Stanford University

  • Hyejin Ryu

    • Lawrence Berkeley National Lab
    • Lawrence Berkeley National Laboratory
    • Lawrence Berkeley Natl Lab

  • Artem Pulkin

    • Ecole Polytechnique Federale de Lausanne

  • Zahid Hussain

    • Lawrence Berkeley National Lab
    • Lawrence Berkeley Natl Lab

  • Sung-Kwan Mo

    • Lawrence Berkeley National Lab
    • Lawrence Berkeley Natl Lab
    • Lawrence Berkeley National Laboratory
    • Pohang Accelerator Laboratory
    • Advanced Light Source, Lawrence Berkeley National Laboratory

  • Zhi-Xun Shen

    • Stanford University
    • SLAC National Accelerator Laboratory
    • SLAC - Natl Accelerator Lab
    • Stanford Univ
    • SIMIS, Stanford University
    • Applied Physics, Stanford Univ
    • Stanford University and SLAC National Accelerator Laboratory
    • Applied Physics, Stanford University

  • Oleg Yazyev

    • Chair of computational condensed matter physics, IPHYS, École Polytechnique Fédérale de Lausanne
    • Physics, École Polytechnique Fédérale de Lausanne
    • C3MP, Institute of Physics, ÉCOLE POLYTECHNIQUE FÉDÉRALE DE LAUSANNE (EPFL)
    • C3MP, IPHYS, École Polytechnique Fédérale de Lausanne
    • Ecole Polytechnique Federale de Lausanne

  • Eugene Mele

    • Physics & Astronomy, University of Pennsylvania
    • Physics and Astronomy, University of Pennsylvania
    • Department of Physics and Astronomy, University of Pennsylvania
    • Univ of Pennsylvania
    • University of Pennsylvania

  • Michael Crommie

    • Physics, Univ of California - Berkeley
    • UC Berkeley and LBNL
    • Univ of California - Berkeley
    • UCB
    • Physics, UC Berkeley
    • Physics, University of California, Berkeley
    • Department of physics, University of California - Berkeley
    • Physics, University of California - Berkeley