title: Nonequilibrium transport through a Kondo dot in a magnetic field: perturbation theory and poor man's scaling.
abstract: We consider electron transport through a quantum dot described by the Kondo model in the regime of large transport voltage V in the presence of a magnetic field B with max((V,B)>>T(K). The electric current I and the local magnetization M are found to be universal functions of V/T(K) and B/T(K), where T(K) is the equilibrium Kondo temperature. We present a generalization of the perturbative renormali-zation group to frequency dependent coupling functions, as necessitated by the structure of bare perturbation theory. We calculate I and M within a poor man's scaling approach and find excellent agreement with experiment.
authors.affiliation: Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, D-76128 Karlsruhe, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Rosch
authors.forename: J
authors.initials: J
authors.lastname: Paaske
authors.forename: J
authors.initials: J
authors.lastname: Kroha
authors.forename: P
authors.initials: P
authors.lastname: Wölfle