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Abstract: We extend the renormalized quasiparticle description of the symmetricAnderson model in a magnetic field $H$, developed in earlier work, to thenon-symmetric model. The renormalized parameters are deduced from the lowenergy NRG fixed point for arbitrary field values. We find quasiparticleresonance widths, $\tilde\Delta \sigma(H)$, which depend in general on the spin$\sigma$ as well as $H$. The low temperature static properties can be expressedcompletely in terms of these parameters, which can also be used as inputs for arenormalized perturbation theory. We show that taking into account repeatedquasiparticle scattering gives results for the longitudinal and transversedynamic spin susceptibilities which are in very good agreement with thoseobtained from direct NRG calculations.



Autor: J. Bauer, A.C. Hewson

Fuente: https://arxiv.org/







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