Gating monolayer WTe<sub>2</sub> devices in nano-ARPES

ORAL

Abstract

We investigate the effects of electrostatic doping on a 2D topological semimetal, monolayer WTe2, employing nanometer-resolution angle-resolved photoemission spectroscopy (nano-ARPES). The exfoliated WTe2 monolayer flake rests on an hBN flake and is capped by a monolayer of hBN to prevent oxidation and allow cleaning. During the photoemission measurements a gate voltage can be applied between a thin graphite electrode beneath the hBN and a graphene contact that overlaps the WTe2 on top. The gate is observed to shift the Fermi energy by more than 100 meV, from valence to conduction band of monolayer WTe2. The temperature and doping dependence of the spectrum yield insights into the nature of the bulk conductivity.

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Presenters

  • Paul Nguyen

    • Physics, University of Washington

Authors

  • Paul Nguyen

    • Physics, University of Washington

  • Cheng Chen

    • Advanced Light Source, Lawrence Berkeley National Laboratory
    • ShanghaiTech University

  • Roland Koch

    • Advanced Light Source, Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Laboratory
    • Advanced Light Source

  • Aaron Bostwick

    • Advanced Light Source, Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Laboratory
    • Advanced Light Source, Lawrence Berkeley National Lab
    • Advanced Light Source, E. O. Lawrence Berkeley National Laboratory
    • ALS, Lawrence Berkeley National Lab
    • Advanced Light Source

  • Natalie Teutsch

    • Physics, University of Warwick

  • Viktor Kandyba

    • Elettra - Sincrotrone Trieste
    • Elettra - Sincrotrone Trieste S.C.p.A

  • Alex Victorovich Barinov

    • Elettra - Sincrotrone Trieste
    • Elettra - Sincrotrone Trieste S.C.p.A

  • Neil R Wilson

    • Physics, University of Warwick

  • Yulin Chen

    • Oxford University
    • University of Oxford
    • Physics, University of Oxford
    • Tsinghua University
    • Department of Physics, Oxford university
    • Clarendon Laboratory, Department of Physics, University of Oxford
    • Department of Physics, University of Oxford

  • Eli Rotenberg

    • Advanced Light Source, Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Laboratory
    • Advanced Light Source, Lawrence Berkeley National Lab
    • Advanced Light Source, E. O. Lawrence Berkeley National Laboratory
    • ALS, Lawrence Berkeley National Lab
    • Advanced Light Source

  • Xiaodong Xu

    • University of Washington
    • Physics, University of Washington

  • David Cobden

    • University of Washington
    • Physics, University of Washington