ARPES microscopy of hBN flakes

ORAL

Abstract

Hexagonal boron nitride (hBN) is an essential component in van der Waals heterostructures. It provides high-quality and weakly interacting interfaces that preserve the electronic properties of adjacent materials. We will present the full valence-band (VB) electronic structure of micrometer-sized exfoliated flakes of hBN using angle-resolved photoemission spectroscopy with micrometer and nanometer spatial resolution. We identify the π - and σ -band dispersions, the hBN stacking order, and determine a total VB bandwidth of 19.4 eV. We compare these results with electronic structure data for epitaxial hBN on graphene on silicon carbide grown in situ using a borazine precursor. The epitaxial growth and electronic properties are investigated using photoemission electron microscopy. Our measurements show that the fundamental electronic properties of hBN are highly dependent on the fabrication strategy.

*We acknowledge funding support by the DAAD, the Danish Council for Independent Research (DFF-4090-00125), the VIL- LUM FONDEN (15375), the Swiss National Science Foundation ( P300P2-171221) and the NSF-MRSEC (DMR-1420451). The Advanced Light Source is supported by the Director, Office of Science, BES, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.

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Presenters

  • Roland Koch

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

Authors

  • Roland Koch

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

  • Jyoti Katoch

    • Department of Physics, Carnegie Mellon University

  • Simon K Moser

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

  • Daniel Schwarz

    • Advanced Light Source, Lawrence Berkeley National Laboratory

  • Roland Kawakami

    • Ohio State University
    • Department of Physics, The Ohio State University
    • Physics, The Ohio State University
    • Department of Physics, Ohio State University

  • Aaron Bostwick

    • Advanced Light Source, E.O. Lawrence Berkeley National Lab, Berkeley, CA 94720, USA
    • Advanced Light Source, Lawrence Berkeley National Laboratory
    • ALS, Lawrence National Berkeley Laboratory
    • Advanced Light Source, Lawrence Berkeley National Lab
    • Lawrence Berkeley National Laboratory
    • Advanced Light Source (ALS), E. O. Lawrence Berkeley National Laboratory, USA
    • Advanced Light Source, E. O. Lawrence Berkeley National Laboratory

  • Eli Rotenberg

    • Advanced Light Source, E.O. Lawrence Berkeley National Lab, Berkeley, CA 94720, USA
    • Advanced Light Source, Lawrence Berkeley National Laboratory
    • ALS, Lawrence National Berkeley Laboratory
    • Advanced Light Source, Lawrence Berkeley National Lab
    • Lawrence Berkeley National Laboratory
    • Advanced Light Source (ALS), E. O. Lawrence Berkeley National Laboratory, USA
    • Advanced Light Source, E. O. Lawrence Berkeley National Laboratory

  • Chris Jozwiak

    • Advanced Light Source, E.O. Lawrence Berkeley National Lab, Berkeley, CA 94720, USA
    • Advanced Light Source, Lawrence Berkeley National Laboratory
    • ALS, Lawrence National Berkeley Laboratory
    • Advanced Light Source, Lawrence Berkeley National Lab
    • Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Lab, Berkeley, USA
    • Advanced Light Source (ALS), E. O. Lawrence Berkeley National Laboratory, USA
    • Advanced Light Source, E. O. Lawrence Berkeley National Laboratory

  • Soren Ulstrup

    • Department of Physics and Astronomy, Aarhus University
    • Physics and Astronomy, Aarhus University, Denmark