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Photoemission study of twisted monolayers and bilayers of WSe2 on graphite substrates

Bharti Parashar1,2, Lars Rathmann3, Hyun-Jung Kim4, Iulia Cojocariu1, Aaron Bostwick5, Chris Jozwiak5, Eli Rotenberg5, José Avila6, Pavel Dudin6 et al.

Vitaliy Feyer1, Christoph Stampfer3,7, Bernd Beschoten3,8, Gustav Bihlmayer4, Claus M. Schneider1,2,9, and Lukasz Plucinski1,*

  • 1Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
  • 2Fakultät für Physik, Universität Duisburg-Essen, 47048 Duisburg, Germany
  • 32nd Institute of Physics and JARA-FIT, RWTH Aachen University, 52074 Aachen, Germany
  • 4Peter Grünberg Institute (PGI-1) and Institute for Advanced Simulation (IAS-1), Forschungszentrum Jülich GmbH and JARA, 52425 Jülich, Germany
  • 5Advanced Light Source, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720, USA
  • 6Synchrotron-SOLEIL, Université Paris-Saclay, Saint-Aubin, BP48, F91192 Gif sur Yvette, France
  • 7Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
  • 8JARA-FIT Institute for Quantum Information, Forschungszentrum Jülich GmbH and RWTH Aachen University, 52074 Aachen, Germany
  • 9Physics Department, University of California, Davis, California 95616, USA

  • *l.plucinski@fz-juelich.de
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Phys. Rev. Materials 7, 044004 – Published 14 April, 2023

DOI: https://doi.org/10.1103/PhysRevMaterials.7.044004

Abstract

Using microfocused angle-resolved photoemission spectroscopy we investigated microstructures containing regions of single-layer (SL) and bilayer (BL) WSe2 on graphite substrates at different twist angles between SL WSe2 and graphite and within the BL WSe2. Fermi level electrons emitted from the graphite are sharply focused near their Kgr points in the Brillouin zone, and, when passing through the WSe2, get diffracted to form band replicas readily observed in experimental Fermi surface maps from twisted SL WSe2/graphite. We investigated two twisted BL WSe2 at twist angles ∼28∘ and ∼10∘ and found no evidence of hybridization gaps at the interlayer band-crossing points, that could be precursors of the flat bands at smaller twist angles. Similarly, no such gaps were found for SL WSe2/graphite. Experimental results are complemented by theoretical density functional theory calculations, which suggest that a formation of hybridization gaps in the WSe2/graphene (which approximates the experimental WSe2/graphite system) sensitively depends on the WSe2 band character at the crossing point with the graphene Dirac band.

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Phys. Rev. Materials 7, 044004– Published 14 April, 2023
  • Received 18 December 2022
  • Accepted 17 February 2023
Article part of CHORUS
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