Anderson impurity in pseudo-gap Fermi systems
强关联电子
2009-10-30 v1
摘要
We use the numerical renormalization group method to study an Anderson impurity in a conduction band with the density of states varying as rho(omega) \propto |omega|^r with r>0. We find two different fixed points: a local-moment fixed point with the impurity effectively decoupled from the band and a strong-coupling fixed point with a partially screened impurity spin. The specific heat and the spin-susceptibility show powerlaw behaviour with different exponents in strong-coupling and local-moment regime. We also calculate the impurity spectral function which diverges (vanishes) with |omega|^{-r} (|\omega|^r) in the strong-coupling (local moment) regime.
引用
@article{arxiv.cond-mat/9707010,
title = {Anderson impurity in pseudo-gap Fermi systems},
author = {R. Bulla and Th. Pruschke and A. C. Hewson},
journal= {arXiv preprint arXiv:cond-mat/9707010},
year = {2009}
}
备注
8 pages, LaTeX, 4 figures includes as eps-files