Instabilities of the AA-stacked graphene bilayer

A. L. Rakhmanov, A. V. Rozhkov, A. O. Sboychakov, Franco Nori

Research output: Contribution to journalArticlepeer-review

76 Citations (Scopus)

Abstract

Tight-binding calculations predict that the AA-stacked bilayer graphene has one electron and one hole conducting band, and that the Fermi surfaces of these bands coincide. We demonstrate that as a result of this degeneracy, the bilayer becomes unstable with respect to a set of spontaneous symmetry violations. Which of the symmetries is broken depends on the microscopic details of the system. For strong on-site Coulomb interaction we find that antiferromagnetism is the most stable order parameter. For an on-site repulsion energy typical for graphene systems, the antiferromagnetic gap can exist up to room temperature.

Original languageEnglish
Article number206801
JournalPhysical Review Letters
Volume109
Issue number20
DOIs
Publication statusPublished - 13 Nov 2012
Externally publishedYes

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