Excitonic gap, phase transition, and quantum Hall effect in graphene: strong-coupling regime

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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 excitonic and spin gaps. The strong-coupling regime is described using a phenomenological model with enhanced Zeeman splitting (spin gap) and excitonic gaps. The experimental form of the Hall conductivity $σ_{xy}$ with the additional $ν= 0, \pm 1$ plateaus is reproduced. The form of $σ_{xy}$ in the case of a strong-coupling regime with no enhanced Zeeman splitting is also discussed.
Revtex4, 10 pages, 6 figures

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Strongly Correlated Electrons, Mesoscale and Nanoscale Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/120247

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0612488
 http://arxiv.org/abs/cond-mat/0612488

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arXiv