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

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

2001-05-02

arxiv.org/abs/cond-mat/0105032v1

Phys. Rev. Lett. 87, 156802 (2001).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.87.156802

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.

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