title: Interaction-induced magnetoresistance: from the diffusive to the ballistic regime.
abstract: We study interaction-induced quantum correction deltasigma(alphabeta) to the conductivity tensor of electrons in two dimensions for arbitrary Ttau, where T is the temperature and tau the transport mean free time. A general formula is derived, expressing deltasigma(alphabeta) in terms of classical propagators ("ballistic diffusons"). The formalism is used to calculate the interaction contribution to the magnetoresistance in a classically strong transverse field and smooth disorder in the whole range of temperatures from the diffusive (Ttau<<1) to the ballistic (Ttau greater, similar 1) regime.
authors.affiliation: Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, 76128 Karlsruhe, Germany.
authors.forename: I V
authors.initials: IV
authors.lastname: Gornyi
authors.forename: A D
authors.initials: AD
authors.lastname: Mirlin