Scaling and Decoherence in the Out-of-Equilibrium Kondo Model

Abstract

We study the Kondo effect in quantum dots in an out-of-equilibrium state due to an applied dc-voltage bias. Using the method of infinitesimal unitary transformations (flow equations), we develop a perturbative scaling picture that naturally contains both equilibrium coherent and non-equilibrium decoherence effects. This framework allows one to study the competition between Kondo effect and current-induced decoherence, and it establishes a large regime dominated by single-channel Kondo physics for asymmetrically coupled quantum dots.

4 pages, 3 figures; v2: minor changes (typos corrected, esp. in Eqs. (3), (4), references updated, improved layout for figures)

References in corpus (2)

• Nonequilibrium Transport through a Kondo Dot in a Magnetic Field: Perturbation Theory
• Nonequilibrium Transport through a Kondo Dot: Decoherence Effects

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