Current induced decoherence in the multichannel Kondo problem

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 K >> 1, 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 T_K, V << T_K. Besides the applied voltage V, the current induced decoherence rate Γ<< V 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 be very effective in prohibiting the flow towards new nonequilibrium fixed points even in variants of the Kondo model where currents are partially suppressed.

4+ pages, 1 figure

References in corpus (4)

• Observation of the two-channel Kondo effect
• Nonequilibrium Transport through a Kondo Dot: Decoherence Effects
• Real-time renormalization group in frequency space: A 2-loop analysis of the nonequilibrium anisotropic Kondo model at finite magnetic field
• Coulomb Gas on the Keldysh Contour: Anderson-Yuval-Hamann representation of the Nonequilibrium Two Level System

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• Quantum criticality out of equilibrium in the pseudogap Kondo model
• Quantum criticality in Kondo quantum dot coupled to helical edge states of interacting 2D topological insulators
• Systematic compactification of the two-channel Kondo model. II. Comparative study of scaling and universality
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• Transport properties of a multichannel Kondo dot in a magnetic field