Perturbative Approach to the Nonequilibrium Kondo Effect in a Quantum Dot

Details Perturbative Approach to the Nonequilibrium Kondo Effect in a Quantum Dot Perturbative Approach to the Nonequilibrium Kondo Effect in a Quantum Dot

2002-11-27

arxiv.org/abs/cond-mat/0211616v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 6 figures, REVTeX4, Final version accepted for publication in Phys. Rev. B 2003. We decided to eliminate the result o

Scientific paper

10.1103/PhysRevB.68.155310

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.

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