Interplay between local electron correlation and Janh-Teller electron-phonon interaction

초록

The infinite-U Anderson model coupled to a Jahn-Teller phonon is studied using the slave boson method on the basis of the large degeneracy expansion (1/N) scheme. The model Hamiltonian acts on the orbital degrees of freedom. The main focus is on the interplay between strong local electron correlation and weak Jahn-Teller electron-phonon interaction. The Kondo temperature is found to decrease by Jahn-Teller interaction. The influence of the Jahn-Teller interaction on dynamical correlation functions is very significant, in sharp contrast with the case of the Holstein-type phonon which couples to charge degrees of freedom.

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