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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