Numerical renormalization group study of the O(3)-symmetric Anderson model |
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Authors: | R. Bulla A.C. Hewson |
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Affiliation: | 121. Department of Mathematics, Imperial College, 180 Queen’s Gate, London, SW7 2BZ, UK
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Abstract: | We use the numerical renormalization group method to study the O(3)-symmetric version of the impurity Anderson model of Coleman and Schofield. This model is of general interest because it displays both Fermi liquid and non-Fermi liquid behaviour, and in the large U limit can be related to the compactified two channel Kondo model of Coleman, Ioffe and Tsvelik. We calculate the thermodynamics for a parameter range which covers the full range of behaviour of the model. We find a non-Fermi liquid fixed point in the isotropic case which is unstable with respect to channel anisotropy. |
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