Persistent current states in bilayer graphene

Jeil Jung, Marco Polini, A. H. Macdonald

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

We argue that at finite carrier density and large displacement fields, bilayer graphene is prone to l=0 and l=1 Pomeranchuk Fermi-surface instabilities. The broken symmetries are driven by nonlocal exchange interactions which favor momentum-space condensation. We find that electron-electron interactions lead first to spontaneous valley polarization, which breaks time-reversal invariance and is associated with spontaneous orbital magnetism, and then under some circumstances to a nematic phase with reduced rotational symmetry. When present, nematic order is signaled by reduced symmetry in the dependence of optical absorption on light polarization.

Original languageEnglish
Article number155423
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number15
DOIs
StatePublished - 20 Apr 2015

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