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Fermi Liquid Theory for Nonlinear Transport through a Multilevel Anderson Impurity
Yoshimichi Teratani1, Rui Sakano2, Akira Oguri3
1Department of Physics, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan.
Abstract:
We present a microscopic Fermi liquid view on the low-energy transport through an Anderson impurity with N discrete levels, at arbitrary electron filling N_{d}. It is applied to nonequilibrium current fluctuations, for which the two-quasiparticle collision integral and the three-body correlations that determine the quasiparticle energy shift play important roles. Using the numerical renormalization group up to N=6, we find that for strong interactions the three-body fluctuations are determined by a single parameter other than the Kondo energy scale in a wide filling range 1≲N_{d}≲N-1. It significantly affects the current noise for N>2 and the behavior of noise in magnetic fields.
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