Strain and spin‐orbit coupling engineering in twisted ws2/graphene heterobilayer

Cyrine Ernandes, Lama Khalil, Hugo Henck, Meng Qiang Zhao, Julien Chaste, Fabrice Oehler, Alan T. Charlie Johnson, Maria C. Asensio, Debora Pierucci, Marco Pala, José Avila, Abdelkarim Ouerghi

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The strain in hybrid van der Waals heterostructures, made of two distinct two‐dimen-sional van der Waals materials, offers an interesting handle on their corresponding electronic band structure. Such strain can be engineered by changing the relative crystallographic orientation between the constitutive monolayers, notably, the angular misorientation, also known as the “twist angle”. By combining angle‐resolved photoemission spectroscopy with density functional theory calculations, we investigate here the band structure of the WS2/graphene heterobilayer for various twist angles. Despite the relatively weak coupling between WS2 and graphene, we demonstrate that the resulting strain quantitatively affects many electronic features of the WS2 monolayers, including the spin‐orbit coupling strength. In particular, we show that the WS2 spin‐orbit splitting of the valence band maximum at K can be tuned from 430 to 460 meV. Our findings open perspectives in controlling the band dispersion of van der Waals materials.

Original languageEnglish (US)
Article number2921
JournalNanomaterials
Volume11
Issue number11
DOIs
StatePublished - Nov 2021

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • General Materials Science

Keywords

  • Band structure
  • Spin‐orbit coupling
  • Twisted heterobilayer
  • Van der Waals materials

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