Electron-electron interactions in nonequilibrium bilayer graphene

Weizhe Edward Liu, Allan H. MacDonald, Dimitrie Culcer

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3 Citations (Scopus)

Abstract

Conducting steady states of doped bilayer graphene have a nonzero sublattice pseudospin polarization. Electron-electron interactions renormalize this polarization even at zero temperature, when the phase space for electron-electron scattering vanishes. We show that, because of the strength of interlayer tunneling, electron-electron interactions nevertheless have a negligible influence on the conductivity, which vanishes as the carrier number density goes to zero. The influence of interactions is qualitatively weaker than in the comparable cases of single-layer graphene or topological insulators, because the momentum-space layer pseudospin vorticity is 2 rather than 1. Our study relies on the quantum Liouville equation in the first Born approximation with respect to the scattering potential, with electron-electron interactions taken into account self-consistently in the Hartree-Fock approximation and screening in the random phase approximation. Within this framework the result we obtain is exact.

Original languageEnglish
Article number085408
JournalPhysical Review B
Volume87
Issue number8
DOIs
Publication statusPublished - 6 Feb 2013
Externally publishedYes

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