Critical Kondo Destruction in a Pseudogap Anderson Model: Scaling and Relaxational Dynamics
Abstract
We study the pseudogap Anderson model as a prototype system for critical Kondo destruction. We obtain finite-temperature (T) scaling functions near its quantum-critical point, by using a continuous-time quantum Monte Carlo method and also considering a dynamical large-N limit. We are able to determine the behavior of the scaling functions in the typically difficult to access quantum-relaxational regime (ℏω<kBT) and conclude that the relaxation rates for both the spin and single-particle excitations are linear in temperature. We discuss the implications of these results for the quantum-critical phenomena in heavy-fermion metals.
- Publication:
-
Physical Review Letters
- Pub Date:
- August 2011
- DOI:
- 10.1103/PhysRevLett.107.076404
- arXiv:
- arXiv:0912.4521
- Bibcode:
- 2011PhRvL.107g6404G
- Keywords:
-
- 71.10.Hf;
- 71.27.+a;
- 75.20.Hr;
- Non-Fermi-liquid ground states electron phase diagrams and phase transitions in model systems;
- Strongly correlated electron systems;
- heavy fermions;
- Local moment in compounds and alloys;
- Kondo effect valence fluctuations heavy fermions;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 4+ pages, 3 EPS figures