The model of two-level Kondo effect is studied by the Wilson numerical renormalization group method. It is shown that there exist a new type of weak-coupling fixed point other than the strong-coupling fixed point found by Vladar and Zawadowski two decades ago by means of the one-loop and two-loop renormalization group methods.
@article{arxiv.cond-mat/0303299,
title = {Numerical renormalization group study of two-level Kondo effect: Discovery of new fixed point},
author = {M. Kojima and S. Yotsuhashi and K. Miyake},
journal= {arXiv preprint arXiv:cond-mat/0303299},
year = {2007}
}