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

TL;DR

This paper investigates the phase transitions and fixed points in a multi-channel Bose-Fermi Kondo model, revealing similarities with single-channel models and analyzing dynamical scaling near quantum critical points.

Contribution

It extends the understanding of Kondo physics by analyzing a large-N SU(N) x SU(kappa N) model with multiple fixed points and quantum critical behavior.

Findings

Identification of three fixed points: non-Fermi liquid, spin-liquid, and Kondo-destroying QCP.

The QCP shares features with the single-channel model despite different Kondo phases.

Analysis of dynamical scaling evolution away from the QCP.

Abstract

We consider the SU(N) x SU(kappa 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.