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arXiv:cond-mat/0409755 · The European Physical Journal B

The anisotropic multichannel spin-$\mathsf{S}$ Kondo model: Calculation of scales from a novel exact solution

Michael Bortz, A. Klümper

Published Jul 1, 2004• 6 citations
arXivHTMLPDF
DOI
10.1140/epjb/e2004-00235-5

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The anisotropic multichannel spin-S\mathsf{S}S Kondo model: Calculation of scales from a novel exact solution
We solve the multichannel Kondo model with channel anisotropy using the Bethe ansatz method. The model generates energy scales, characterizing the neighborhoods of the various infrared fixed points, reflecting the structure of the symmetry breaking in the channel sector. The nature of these fixed points also depends on the magnitude of the impurity spin SSS. We present a detailed discussion for the two channel case and point out some possible non-Fermi-liquid behavior.
We study how the multichannel Kondo effect is dynamically induced to affect the photoemission and the inverse photoemission spectrum when an electron is emitted from (or added to) the completely screened Kondo impurity with spin S>1/2.S>1/2.S>1/2. The spectrum thereby shows a power-law edge singularity characteristic of the multichannel Kondo model. We discuss this anomalous behavior by using the exact solution of the multichannel Kondo model and boundary conformal field theory. The idea is further applied to the photoemission for quantum spin systems, in which the edge singularity is controlled by the dynamically induced overscreening effect with a mobile Kondo impurity.