Photoexcited electron dynamics in Kondo insulators and heavy fermions

Details Photoexcited electron dynamics in Kondo insulators and heavy fermions Photoexcited electron dynamics in Kondo insulators and heavy fermions

2005-12-06

arxiv.org/abs/cond-mat/0512108v1

Physics

Condensed Matter

Strongly Correlated Electrons

accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.96.037401

We have studied the photoexcited carrier relaxation dynamics in the Kondo insulator SmB6 and the heavy fermion metal YbAgCu4 as a function of temperature and excitation level. The dynamic response is found to be both strongly temperature dependent and nonlinear. The data are analyzed with a Rothwarf-Taylor bottleneck model, where the dynamics are governed by the presence of a narrow gap in the density of states near the Fermi level. The remarkable agreement with the model suggests that carrier relaxation in a broad class of heavy electron systems (both metals and insulators) is governed by the presence of a (weakly temperature dependent) hybridization gap.

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