The Kondo effect in quantum dots at high voltage: Universality and scaling

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 T_K, the physics is governed by the scales V and gamma, where gamma ~ V/ln^2(V/T_K) 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/T_K) >> 1. However, in certain variants of the Kondo problem, two-channel Kondo physics is induced by a large voltage V.

4 pages, 3 figures

References in corpus (2)

• Is the quantum dot at large bias a weak-coupling problem?
• Nonequilibrium Electron Distribution in Presence of Kondo Impurities

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