Excitonic gap, phase transition, and quantum Hall effect in graphene

Details Excitonic gap, phase transition, and quantum Hall effect in graphene Excitonic gap, phase transition, and quantum Hall effect in graphene

2006-05-12

arxiv.org/abs/cond-mat/0605348v3

Phys.Rev.B74:195429,2006

Physics

Condensed Matter

Strongly Correlated Electrons

Revtex4, 10 pages, 4 figures, text essentially extended, one figure and references added; v3: to match PRB version

Scientific paper

10.1103/PHYSREVB.74.195429

We suggest that physics underlying the recently observed removal of sublattice and spin degeneracies in graphene in a strong magnetic field describes a phase transition connected with the generation of an excitonic gap. The experimental form of the Hall conductivity is reproduced and the main characteristics of the dynamics are described. Predictions of the behavior of the gap as a function of temperature and a gate voltage are made.

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