Kondo Effect in Fermi Systems with a Gap: A Renormalization Group Study
Abstract
We present the results of a Wilson Renormalization Group study of the single-impurity Kondo and Anderson models in a system with a gap in the conduction electron spectrum. The behavior of the impurity susceptibility and the zero-frequency response function, T<<Sz; Sz>> are discussed in the cases with and without particle-hole symmetry. In addition, for the asymmetric Anderson model the correlation functions, < S · σ (0)>,<nd>, and <nd(2-nd)> are computed.
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