QSeminar: Louis Garrigue

Speaker: Louis Garrigue

Title: Variational perturbation theory : more accurate effective operators for graphene

Abstract: The macroscopic description of graphene is in general given by a massless Dirac operator. We show how the coupling of three methods (variational approximation, perturbation theory and a multiscale approach) enables to obtain corrected operators, leading to more accurate effective models : we present the numerical improvement and a new theoretical result on the long-term validity time.