The Kondo effect in quantum dots at high voltage: Universality and scaling
A. Rosch, J. Kroha, P. Wölfle
Abstract
We examine the properties of a dc-biased quantum dot in the Coulomb blockade regime. For voltages V large compared to the Kondo temperature TK, the physics is governed by the scales V and gamma, where gamma ~ V/ln2(V/TK) is the non-equilibrium decoherence rate induced by the voltage-driven current. Based on scaling arguments, self-consistent perturbation theory and perturbative renormalization group, we argue that due to the large gamma, the system can be described by renormalized perturbation theory for ln(V/TK) >> 1. However, in certain variants of the Kondo problem, two-channel Kondo physics is induced by a large voltage V.
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