Universality of conductivity in interacting graphene

Details Universality of conductivity in interacting graphene Universality of conductivity in interacting graphene

2011-01-11

arxiv.org/abs/1101.2169v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

The Hubbard model on the honeycomb lattice describes charge carriers in graphene with short range interactions. While the interaction modifies several physical quantities, like the value of the Fermi velocity or the wave function renormalization, the a.c. conductivity has a universal value independent of the microscopic details of the model: there are no interaction corrections, provided that the interaction is weak enough and that the system is at half filling. We give a rigorous proof of this fact, based on exact Ward Identities and on constructive Renormalization Group methods.

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