The present work is based on the nonequilibrium perturbative formalism. There the self-energies are derived up to the forth-order. In consequence, it proves that the nonequilibrium (real-time) perturbative expansion can be connected with the Matsubara imaginary-time perturbative expansion for equilibrium. As the numerical results, the Kondo resonance still disappears for bias voltage exceeding the Kondo temperatures, as observed in experiments of two terminal systems.
@article{arxiv.cond-mat/0506752,
title = {Nonequilibrium Perturbative Formalism and Spectral Function for the Anderson Model},
author = {Mami Hamasaki},
journal= {arXiv preprint arXiv:cond-mat/0506752},
year = {2007}
}
Comments
Some conclusions and typos are corrected;the derived expressions and numerical results are unchanged