Perturbative Approach to the Nonequilibrium Kondo Effect in a Quantum Dot

Abstract

The theory of quantum transport through a dot under a finite bias voltage is developed using perturbation theory in the Keldysh formalism. It is found that the Kondo resonance splits into double peaks when the voltage exceeds the Kondo temperature, $eV>k_B{T}_K$, which leads to the appearance of a second peak in conductance, in addition to the zero-bias peak. The possible relevance of the new peak to the 0.7 conductance anomaly observed in quantum point contact is discussed.

5 pages, 6 figures, REVTeX4, Final version accepted for publication in Phys. Rev. B 2003. We decided to eliminate the result of U=8, and thus the old result should not be referred to

References in corpus (5)

• The Low-Temperature Fate of the 0.7 Structure in a Point Contact: A Kondo-like Correlated State in an Open System
• The Kondo effect in quantum dots at high voltage: Universality and scaling
• Fermi liquid theory for the Anderson model out of equilibrium
• Measuring the Out-of-Equilibrium Splitting of the Kondo Resonance
• Kondo resonance in a multi-probe quantum dot

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