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Current-induced decoherence in the multichannel Kondo problem.

Aditi Mitra¹, Achim Rosch

¹Department of Physics, New York University, 4 Washington Place, New York, New York 10003, USA.

Physical Review Letters

|April 8, 2011

Summary

This study investigates a spin-1/2 system coupled to multiple wires under bias voltage. Even small voltages split the Kondo resonance, with decoherence playing a crucial role in system properties.

Area of Science:

Condensed matter physics
Quantum transport phenomena

Background:

The Kondo effect describes the magnetic impurities in metals, leading to a many-body resonance.
Understanding non-equilibrium quantum systems is crucial for developing advanced electronic devices.

Purpose of the Study:

To investigate the behavior of a single spin coupled to multiple independent wires under applied bias voltages.
To analyze the influence of voltage and decoherence on the Kondo resonance and system properties.

Main Methods:

Perturbative renormalization group approach for K >> 1 channels.
Analysis of voltage-dependent scaling functions for conductance and T matrix.
Inclusion of current-induced decoherence rate (Γ).

Main Results:

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Kondo resonance splitting occurs even for bias voltages V << Kondo temperature T(K).
Decoherence rate Γ significantly influences system properties alongside applied voltage V.
Decoherence effectively prevents flow towards new non-equilibrium fixed points.

Conclusions:

The multi-channel Kondo model exhibits distinct non-equilibrium behavior compared to the single-channel case.
Decoherence is a critical factor in stabilizing or destabilizing non-equilibrium states.
Findings offer insights into quantum transport in mesoscopic systems under bias.