Instabilities of the AA-stacked graphene bilayer.

Phys Rev Lett

Advanced Science Institute, RIKEN, Wako-shi, Saitama, 351-0198, Japan.

Published: November 2012

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.

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http://dx.doi.org/10.1103/PhysRevLett.109.206801DOI Listing

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