Renormalized parameters and perturbation theory for an n-channel Anderson model with Hund's rule coupling: Asymmetric case - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




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Abstract: We explore the predictions of the renormalized perturbation theory for ann-channel Anderson model, both with and without Hund-s rule coupling, in theregime away from particle-hole symmetry. For the model with n=2 we deduce therenormalized parameters from numerical renormalization group calculations, andplot them as a function of the occupation at the impurity site, nd. From thesewe deduce the spin, orbital and charge susceptibilities, Wilson ratios andquasiparticle density of states at T=0, in the different parameter regimes,which gives a comprehensive overview of the low energy behavior of the model.We compare the difference in Kondo behaviors at the points where nd=1 and nd=2.One unexpected feature of the results is the suppression of the chargesusceptibility in the strong correlation regime over the occupation numberrange 1


Author: Yunori Nishikawa, Daniel D.G. Crow, Alex C. Hewson

Source: https://arxiv.org/



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