Strong Coupling Approach to the Supersymmetric Kondo Model
Strongly Correlated Electrons
2009-10-31 v3
Abstract
We carry out the strong coupling expansion for the SU(N) Kondo model where the impurity spin is represented by a L-shaped Young tableau. Using second order perturbation theory around the strong coupling fixed point it is shown that when the antisymmetric component of the Young-tableau contains more than N/2 entries, the strong-coupling fixed point becomes unstable to a two-stage Kondo effect. By comparing the strong coupling results obtained here with the result using a supersymmetric large N expansion, we are also able to confirm the validity of the the supersymmetric formalism for mixed symmetry Kondo models.
Keywords
Cite
@article{arxiv.cond-mat/0001002,
title = {Strong Coupling Approach to the Supersymmetric Kondo Model},
author = {P. Coleman and C. Pepin and A. M. Tsvelik},
journal= {arXiv preprint arXiv:cond-mat/0001002},
year = {2009}
}
Comments
References and corrections added. Two column version http://www.physics.rutgers.edu/~coleman/strx.ps.gz