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1/(N − 1) Expansion Approach to Full-counting Statistics for the SU(N) Anderson Model
Akira Oguri,Rui Sakano 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We apply a recently developed 1/(N − 1) expansion to the full-counting statistics for the N-folddegenerate Anderson impurity model in the Kondo regime. This approach is based on the perturbationtheory in the Coulomb interaction U and is different from the conventional large-N theories,such as the usual 1/N expansion and non-crossing approximation. We have confirmed that thecalculations carried out up to order 1/(N −1)2 agree closely with those of the numerical renormalizationgroup at N = 4, where the degeneracy is still not so large. This ensures the applicabilityof our approach for N 4. We present the results of the cumulants of the probability distributionfunction for a nonequilibrium current through a quantum dot in the particle-hole symmetric case.