Kondo effect in quantum dots at high voltage: universality and scaling |
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Authors: | Rosch A Kroha J Wölfle P |
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Affiliation: | Institut für Theorie der Kondensierten Materie, Universit?t Karlsruhe, D-76128 Karlsruhe, Germany. |
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Abstract: | We examine the properties of a dc-biased quantum dot in the Coulomb blockade regime. For voltages V that are large compared to the Kondo temperature T(K), the physics is governed by the scales V and gamma, where gamma approximately V/ln(2)(V/T(K)) is the nonequilibrium 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 in 1/ln(V/T(K))<1. However, in certain variants of the Kondo problem, two-channel Kondo physics is induced by a large voltage V. |
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