Mixed-stacking few-layer graphene as an elemental weak ferroelectric material

Aitor García-Ruiz Fuentes, Vladimir Enaldiev, Andrew Mcellistrim, Vladimir Fal'ko

Research output: Contribution to journal › Letter › peer-review

Abstract

Ferroelectricity1 - a spontaneous formation of electric polarisation - is a solid state phenomenon, usually, associated with ionic compounds or complex materials. Here we show that, atypically for elemental solids, few-layer graphenes can host an equilibrium out-of-plane electric polarisation, switchable by sliding the constituent graphene sheets. The systems hosting such effect include mixed-stacking tetralayers and thicker (5-9 layers) rhombohedral graphitic films with a twin boundary in the middle of a flake. The predicted electric polarisation would also appear in marginally (small-angle) twisted few-layer flakes, where lattice reconstruction would give rise to networks of mesoscale domains with alternating value and sign of out-ofplane polarisation.
Original languageEnglish
Pages (from-to)4120 - 4125
JournalNano Letters
Volume23
Issue number10
Early online date9 May 2023
DOIs
Publication statusPublished - 24 May 2023

Keywords

  • Ferroelectricity
  • graphene
  • rhombohedral graphite
  • twin boundary
  • twistronics
  • screening

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  • CDT in Science and Applications of Graphene and Related Nanomaterial

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    1/04/14 → 31/10/25

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