Critical theory of the asymmetric pseudogap Kondo problem

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  • 10 September 2003
Abstract
Impurity moments coupled to fermionic quasiparticles with a pseudogap density of states display a zero-temperature transition between a screened and a free moment phase upon variation of the Kondo coupling. Here we describe the universal theory of this quantum phase transition for the experimentally relevant case of particle-hole asymmetry. The theory takes the form of a crossing between effective singlet and doublet levels, interacting with low-energy fermions. Depending on the pseudogap exponent, this interaction is either relevant or irrelevant under renormalization group transformations. Using perturbative renormalization group techniques we compute various critical properties, compare with numerical results, and point out implications for experiments.

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