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 / Giuliani, A.; Mastropietro, V.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 85:4(2012), pp. 1-8. [10.1103/PhysRevB.85.045420]
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
