5 S ep 1 99 6 Solution of two channel spin - flavor Kondo model
نویسنده
چکیده
We investigate a model where an impurity couples to both the spin and the flavor currents of the two channel conduction electrons. This model can be used as a prototype model of a magnetic impurity tunneling between two sites in a metal and of some heavy fermion systems where the ground state of the impurity has a fourfold degeneracy. The system is shown to flow to a doubly degenerate fermi-liquid fixed point with non-fermi liquid boundary operators. A spin-flavor coupling double tensor term is shown to drive the system to singlet fermi liquid fixed points with fermi liquid boundary operators. The relation with SU(4) Coqblin-Schrieffer model is studied. The crossover behaviors between different fixed points are discussed. Typeset using REVTEX
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