Quantum chaos of the Bose-Fermi Kondo model at intermediate temperature

Quantum phase transitions in the Bose-Fermi Kondo model

Pseudogap Fermi-Bose Kondo model.

We consider a magnetic impurity coupled to both fermionic quasiparticles with a pseudogap density of states and bosonic spin fluctuations. Using renormalization group and large-N calculations we investigate the phase diagram of the resulting Fermi-Bose Kondo model. We show that the Kondo temperature is strongly reduced by low-energy spin fluctuations, and make connections to experiments in cupr...

Quantum critical Kondo destruction in the Bose-Fermi Kondo model with a local transverse field

Recent studies of the global phase diagram of quantum-critical heavy-fermion metals prompt consideration of the interplay between the Kondo interactions and quantum fluctuations of the local moments alone. Toward this goal, we study a Bose-Fermi Kondo model (BFKM) with Ising anisotropy in the presence of a local transverse field that generates quantum fluctuations in the local-moment sector. We...

Numerical renormalization-group study of the Bose-Fermi Kondo model.

We extend the numerical renormalization-group method to Bose-Fermi Kondo models (BFKMs), describing a local moment coupled to a conduction band and a dissipative bosonic bath. We apply the method to the Ising-symmetry BFKM with a bosonic bath spectral function eta(omega) proportional omega(s), of interest in connection with heavy-fermion criticality. For 0 < s < 1, an interacting critical point...

Quantum criticality in the pseudogap Bose-Fermi Anderson and Kondo models: Interplay between fermion- and boson-induced Kondo destruction

J. H. Pixley,1 Stefan Kirchner,2,3 Kevin Ingersent,4 and Qimiao Si1 1Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA 2Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany 3Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany 4Department of Physics, University of Florida, Gainesville, Florida 32611-8440, USA (Recei...