Anomalous Exciton-Condensation in Graphene Bilayers

Details Anomalous Exciton-Condensation in Graphene Bilayers Anomalous Exciton-Condensation in Graphene Bilayers

2009-09-08

arxiv.org/abs/0909.1502v1

Phys. Rev. Lett. 104 096802 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.104.096802

In ordinary semiconductor bilayers, exciton condensates appear at total Landau level filling factor $\nu_{T}=1$. We predict that similar states will occur in Bernal stacked graphene bilayers at many non-zero integer filling factors. For $\nu_{T} = -3,1$ we find that the superfluid density of the exciton condensate vanishes and that a finite-temperature fluctuation induced first order isotropic-smectic phase transition occurs when the layer densities are not balanced. These anomalous properties of bilayer graphene exciton condensates are due to the degeneracy of Landau levels with $n=0$ and $n=1$ orbital character.

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