Observation of superlattice periodicity on the surface of highly-doped MoS2

ORAL

Abstract

We have used low temperature (~5 K) scanning tunnelling microscopy (STM) and spatially-resolved tunnelling spectroscopy (STS/CITS) to investigate the surface of highly-doped molybdenum disulphide (MoS2). In agreement with previous STM investigations of intrinsic MoS2 we find the surface exhibits a large density of charged point defects [e.g., ACS Appl. Mater. Interfaces, 9, 19278 (2017)]. Fourier analysis of our atomic-resolution imaging and spectroscopy data from the doped MoS2 surface reveals two separate superlattice periodicities in addition to the 1x1 sulphur lattice, one of which is enhanced in the vicinity of the charged defects. We present an interpretation of the observed superlattices consistent with prior DFT and ARPES data.

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Presenters

  • Steven Schofield

    University College London, London Centre for Nanotechnology and Department of Physics and Astronomy, University College London

Authors

  • Steven Schofield

    University College London, London Centre for Nanotechnology and Department of Physics and Astronomy, University College London

  • Mohammed Bin Subhan

    London Centre for Nanotechnology and Department of Physics and Astronomy, University College London

  • Asif Suleman

    London Centre for Nanotechnology and Department of Physics and Astronomy, University College London

  • Gareth Moore

    London Centre for Nanotechnology and Department of Physics and Astronomy, University College London

  • Peter Phu

    London Centre for Nanotechnology and Department of Physics and Astronomy, University College London

  • HIdekazu Kurebayashi

    London Centre for Nanotechnology, University College London, London Centre for Nanotechnology and Department of Physics and Astronomy, University College London

  • Chris A. Howard

    London Centre for Nanotechnology and Department of Physics and Astronomy, University College London