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

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

2004-10-13

arxiv.org/abs/cond-mat/0410341v2

Phys. Rev. Lett. 95, 056602 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevLett.95.056602

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.

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