Lateral band bending and defects in WS<sub>2</sub> flakes

ORAL

Abstract

The properties of transition metal dichalcogenides are strongly influenced by changes of the electronic structure. Angular resolved photoemission spectroscopy (ARPES) is the ideal tool for obtaining precise information about the electronic state. At the nano-ARPES facility of the MAESTRO beamline at the Advanced Light Source, we combine ARPES with spatial resolution by focusing the illuminating photon beam down to a spot of 100 nm diameter. Nano-ARPES allows us to laterally map differences in band bending and changes in the spectral function of WS2 and hexagonal BN on different substrates. By combining the angular resolved data with laterally resolved core level spectroscopy, we pinpoint the observed changes to edges and/or defects in the materials.

*This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under contract no. DE-AC02-05CH11231. Work at the Molecular Foundry was supported by the Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC0

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Presenters

  • Roland Koch

    • Advanced Light Source, Lawrence Berkeley National Laboratory

Authors

  • Roland Koch

    • Advanced Light Source, Lawrence Berkeley National Laboratory

  • Christoph Kastl

    • Lawrence Berkeley National Laboratory
    • The Molecular Foundry, Lawrence Berkeley National Laboratory
    • Molecular Foundry, Lawrence Berkeley National Laboratory

  • Søren Ulstrup

    • Lawrence Berkeley Natl Lab
    • Lawrence Berkeley National Laboratory
    • Aarhus University
    • Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University

  • Jyoti Katoch

    • Department of Physics, Ohio State Univ - Columbus
    • Department of Physics, Ohio State University
    • Department of Physics, The Ohio State University

  • Simon Moser

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

  • Christopher Chen

    • Lawrence Berkeley National Laboratory
    • Molecular Foundry, Lawrence Berkeley National Laboratory

  • Tevye Kuykendall

    • Lawrence Berkeley National Laboratory
    • Molecular Foundry, Lawrence Berkeley National Laboratory

  • Adam Schwartzberg

    • Lawrence Berkeley National Laboratory
    • The Molecular Foundry, Lawrence Berkeley National Laboratory
    • Molecular Foundry, Lawrence Berkeley National Laboratory

  • Shaul Aloni

    • Lawrence Berkeley National Lab
    • Lawrence Berkeley National Laboratory
    • Molecular Foundry, Lawrence Berkeley National Laboratory
    • Molecular Foundry, Lawrence Berkeley National Lab

  • Alexander Weber-Bargioni

    • Lawrence Berkeley National Laboratory
    • Molecular Foundry, Lawrence Berkeley National Laboratory

  • Eli Rotenberg

    • Advanced light source
    • Lawrence Berkeley Natl Lab
    • Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Lab
    • Advanced Light Source, Lawrence Berkeley National Laboratory

  • Chris Jozwiak

    • Advanced light source
    • Lawrence Berkeley Natl Lab
    • Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Lab
    • Advanced Light Source, Lawrence Berkeley National Laboratory

  • Aaron Bostwick

    • Advanced light source
    • Lawrence Berkeley Natl Lab
    • Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Lab
    • Advanced Light Source, Lawrence Berkeley National Laboratory