Nonequilibrium Transport through a Kondo Dot in a Magnetic Field: Perturbation Theory and Poor Man’s Scaling

A. Rosch, J. Paaske, J. Kroha, and P. Wölfle
Phys. Rev. Lett. 90, 076804 – Published 19 February 2003

Abstract

We consider electron transport through a quantum dot described by the Kondo model in the regime of large transport voltage V in the presence of a magnetic field B with max(V,B)TK. The electric current I and the local magnetization M are found to be universal functions of V/TK and B/TK, where TK is the equilibrium Kondo temperature. We present a generalization of the perturbative renormalization group to frequency dependent coupling functions, as necessitated by the structure of bare perturbation theory. We calculate I and M within a poor man’s scaling approach and find excellent agreement with experiment.

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  • Received 22 February 2002

DOI:https://doi.org/10.1103/PhysRevLett.90.076804

©2003 American Physical Society

Authors & Affiliations

A. Rosch, J. Paaske, J. Kroha, and P. Wölfle

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

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Issue

Vol. 90, Iss. 7 — 21 February 2003

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