title: Rigorous proof of fermi liquid behavior for jellium two-dimensional interacting fermions
abstract: Using the method of continuous constructive renormalization group around the Fermi surface, we prove that a jellium two-dimensional interacting system of fermions at low temperature T is analytic in the coupling constant lambda for |lambda| |logT|</=K, where K is some numerical constant and T is the temperature. In that range of parameters, the first and second derivatives of the self-energy remain bounded, a behavior seen in Fermi liquids but, in particular, not in Luttinger liquids. Our results also prove that in 2D any transition temperature must be nonperturbative in the coupling constant, a result expected on physical grounds. The proof exploits specific momentum conservation rules in two dimensions.
authors.affiliation: Centre de Physique Theorique, Ecole Polytechnique, F-91128 Palaiseau Cedex, France.
authors.initials: M
authors.lastname: Disertori
authors.initials: V
authors.lastname: Rivasseau