Critical Kondo destruction in a pseudogap Anderson model: scaling and relaxational dynamics

Details Critical Kondo destruction in a pseudogap Anderson model: scaling and relaxational dynamics Critical Kondo destruction in a pseudogap Anderson model: scaling and relaxational dynamics

2009-12-23

arxiv.org/abs/0912.4521v2

Physical Review Letters 107, 076404 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4+ pages, 3 EPS figures; final version

Scientific paper

10.1103/PhysRevLett.107.076404

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, 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 (hbar w < k_B T), 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.

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