Speaker
Manuel Weber
(Max Planck Institute for the Physics of Complex Systems)
Description
Dissipative quantum impurity models represent conceptually simple yet non-trivial settings for quantum criticality. Here we consider the SU(2)-symmetric spin-boson (or Bose-Kondo) model with a power-law bath spectrum $\propto \omega^s$, relevant to diverse problems such as cavity quantum electrodynamics, magnetic moments in quantum critical magnets, and Kondo-breakdown transitions in heavy-fermion metals. Using a recently developed wormhole quantum Monte Carlo method, we present high-accuracy results for the phase diagram and find, in addition to a critical phase predicted by perturbative renormalization group (RG), a stable strong-coupling phase present for all values of $0
Primary author
Manuel Weber
(Max Planck Institute for the Physics of Complex Systems)
Co-author
Prof.
Matthias Vojta
(TU Dresden)
