Seminar “Quantum Field Theory”

On Wednesday, 31 August 2016, at 11.30 am in the DIAS Hall (ground floor) of BLTP a seminar “Loops, Triangles and the Optical Conductivity of Graphene” will be held.

Speaker: Sofian Teber (University Pierre et Marie Curie)

Abstract:

This talk will present a review on the computation of interaction corrections to the optical conductivity of disorder-free intrinsic graphene. We will first give a brief introduction to graphene and its low-energy effective description in terms of massless two-dimensional interacting Dirac fermions. Then, we shall review extensive theoretical and experimental works done during the past years on the optical conductivity of graphene and some issues related to effect of interactions. On this basis we shall then consider two limits where the computations have been carried out: the so-called ultra-relativistic limit (graphene its infra-red Lorentz-invariant fixed point) and the non-relativistic limit (with instantaneous Coulomb interactions). In each of these limits, we shall proceed on showing how powerful algebraic multi-loop te chniques, originally developped in QED and QCD to compute dimensionally regularized Feynman integrals, can be applied and may clarify some of the issues related to interaction effects on the minimal conductivity.