Kondo Effect in Quantum Dots at High Voltage: Universality and Scaling

A. Rosch, J. Kroha, and P. Wölfle
Phys. Rev. Lett. 87, 156802 – Published 24 September 2001
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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 TK, the physics is governed by the scales V and γ, where γV/ln2(V/TK) 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 γ the system can be described by renormalized perturbation theory in 1/ln(V/TK)1. However, in certain variants of the Kondo problem, two-channel Kondo physics is induced by a large voltage V.

  • Received 4 May 2001

DOI:https://doi.org/10.1103/PhysRevLett.87.156802

©2001 American Physical Society

Authors & Affiliations

A. Rosch, J. Kroha, and P. Wölfle

  • Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, D-76128 Karlsruhe, Germany

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Vol. 87, Iss. 15 — 8 October 2001

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