Renormalized parameters and perturbation theory for an n-channel Anderson model with Hund's rule coupling: Asymmetric case

Abstract

We explore the predictions of the renormalized perturbation theory for an n-channel Anderson model, both with and without Hund's rule coupling, in the regime away from particle-hole symmetry. For the model with n=2 we deduce the renormalized parameters from numerical renormalization group calculations, and plot them as a function of the occupation at the impurity site, nd. From these we deduce the spin, orbital and charge susceptibilities, Wilson ratios and quasiparticle 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 charge susceptibility in the strong correlation regime over the occupation number range 1 <nd <3.

9 pages, 17 figures

References in corpus (7)

• The numerical renormalization group method for quantum impurity systems
• Kondo effect in quantum dots
• Kondo resonance narrowing in d- and f-electron systems
• Renormalization group study of capacitively coupled double quantum dots
• Field dependent quasiparticles in the infinite dimensional Hubbard model
• Universal scaling in nonequilibrium transport through an Anderson impurity
• A local moment approach to the degenerate Anderson impurity model

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