The optical conductivity of a system of electrons on the honeycomb lattice interacting through a retarded electromagnetic field is computed by exact renormalization-group (RG) methods. By truncating the exact RG expression at one loop we find that the conductivity has the universal value π/2 times the conductivity quantum up to negligible corrections vanishing as a power law in the limit of low frequencies.

Exact renormalization group computation of the optical conductivity of graphene / A. Giuliani, V. Mastropietro. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 85:4(2012), pp. 045420.1-045420.8.

Exact renormalization group computation of the optical conductivity of graphene

V. Mastropietro
2012

Abstract

The optical conductivity of a system of electrons on the honeycomb lattice interacting through a retarded electromagnetic field is computed by exact renormalization-group (RG) methods. By truncating the exact RG expression at one loop we find that the conductivity has the universal value π/2 times the conductivity quantum up to negligible corrections vanishing as a power law in the limit of low frequencies.
Settore MAT/07 - Fisica Matematica
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/298639
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