Current-Induced Decoherence in the Multichannel Kondo Problem

Aditi Mitra and Achim Rosch
Phys. Rev. Lett. 106, 106402 – Published 8 March 2011

Abstract

The properties of a local spin S=1/2 coupled to K independent wires is studied in the presence of bias voltages which drive the system out of thermal equilibrium. For K1, a perturbative renormalization group approach is employed to construct the voltage-dependent scaling function for the conductance and the T matrix. In contrast to the single-channel case, the Kondo resonance is split even by bias voltages small compared to the Kondo temperature TK, VTK. Besides the applied voltage V, the current-induced decoherence rate ΓV controls the physical properties of the system. While the presence of V changes the structure of the renormalization group considerably, decoherence turns out to be very effective in prohibiting the flow towards new nonequilibrium fixed points even in variants of the Kondo model where currents are partially suppressed.

  • Figure
  • Received 12 October 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.106402

© 2011 American Physical Society

Authors & Affiliations

Aditi Mitra1 and Achim Rosch2

  • 1Department of Physics, New York University, 4 Washington Place, New York, New York 10003, USA
  • 2Institute for Theoretical Physics, University of Cologne, 50937 Cologne, Germany

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Issue

Vol. 106, Iss. 10 — 11 March 2011

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