Correlated Topological States in Graphene Nanoribbon Heterostructures

Jan-Philip Joost, Antti-Pekka Jauho, Michael Bonitz*

*Corresponding author for this work

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Abstract

Finite graphene nanoribbon (GNR) heterostructures host intriguing topological in-gap states localized at the edges of both the bulk and the end regions (Rizzo et al., Nature 2018, 560, 204. We employ a Green function method, which allows us to go beyond previous density functional theory simulations and show that electronic correlation effects play a key role in these systems: they result in increased magnetic moments at the ribbon edges accompanied by a significant energy renormalization of the topological end states, even in the presence of a metallic substrate -- bringing the computed features in agreement with the experiments. Furthermore, we discover a striking, novel mechanism that causes an energy splitting of non-zero topological end states for weakly screened systems. We predict that states with similar features are present in other GNR heterostructures as well.
Original languageEnglish
JournalNano Letters
Volume19
Issue number12
Pages (from-to)9045-9050
Number of pages6
ISSN1530-6984
DOIs
Publication statusPublished - 2019

Bibliographical note

This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.

Keywords

  • Graphene nanoribbons
  • Heterostructures
  • Topological states
  • Electronic correlations
  • Green function theory

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