Destruction of the Kondo effect in a multi-channel Bose–Fermi Kondo model

Abstract

We consider the SU ( N ) × SU ( κ N ) generalization of the spin-isotropic Bose–Fermi Kondo model in the limit of large N. There are three fixed points corresponding to a multi-channel non-Fermi liquid phase, a local spin-liquid phase, and a Kondo-destroying quantum critical point (QCP). We show that the QCP has strong similarities with its counterpart in the single-channel model, even though the Kondo phase is very different from the latter. We also discuss the evolution of the dynamical scaling properties away from the QCP.