Elementary Excitations for Impurity Models
Elementary excitations for impurity models are investigated with the use of the Bethe-Ansatz solution. We study three kinds of Hamiltonians concerning the Kondo problem: the ordinary Anderson model, the orbitally degenerate Anderson model and the multi-channel Kondo model. The calculations for the multi-channel Kondo model are further extended to the case at finite temperatures by means of Yang and Yang’s method developed in one-dimensional interacting boson systems.
KeywordsExcitation Spectrum Impurity Model Anderson Model Elementary Excitation Spin Excitation
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