Fermi and Non-Fermi behavior in the anisotropic Multichannel Kondo Model -- Bethe Ansatz solution

TL;DR

This paper provides an exact Bethe Ansatz solution to the anisotropic multichannel Kondo model, revealing how energy scales and fixed points depend on channel anisotropy, impurity spin, and symmetry breaking.

Contribution

It offers a novel exact solution for the anisotropic multichannel Kondo model, elucidating the relationship between energy scales, fixed points, and symmetry breaking.

Findings

Energy scales characterize neighborhoods of infrared fixed points.

Fixed point nature depends on impurity spin S.

Detailed analysis provided for the two-channel case.

Abstract

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, in correspondence to 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 $S$. We present a detailed discussion for the two channel case.