Correlation effects on topological end-states in finite-size graphene nanoribbons in the GW approximation

Antoine Honet, Luc Henrard, Vincent Meunier

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Abstract

Finite size armchair graphene nanoribbons (GNRs) of different families are theoretically studied using the Hubbard model in both mean-field and GW approximations, including spin correlation effects. It is shown that correlation primarily affect the properties of topological end states of the nanoribbons. A representative structure of each of the three GNR families is considered but the seven-atom width nanoribbon is studied in detail and compared to previously published experimental results, showing a clear improvement when correlations are included. Using isolated spin contributions to scanning tunneling microscopy (STM) simulations, spin-polarized measurements in STM are also suggested to help distinguish and highlight correlation effects.

Original languageEnglish
Article number485703
JournalJournal of physics. Condensed matter
Volume35
Issue number48
DOIs
Publication statusPublished - 6 Sept 2023

Keywords

  • graphene nanoribbons
  • Green’s function theory
  • GW approximation
  • Hubbard model
  • mean-field approximation
  • topological end states

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