Journal article

Relaxation dynamics of the Kondo lattice model

  • Werner, Philipp Department of Physics, University of Fribourg, Switzerland
  • Eckstein, Martin Max Planck Research Department for Structural Dynamics, University of Hamburg-CFEL, Germany
Published in:
  • Physical Review B - Condensed Matter and Materials Physics. - 2012, vol. 86, no. 04, p. 045119
English We study the relaxation properties of the Kondo lattice model using the nonequilibrium dynamical mean-field formalism in combination with the noncrossing approximation. The system is driven out of equilibrium either by a magnetic field pulse, which perturbs the local singlets, or by a sudden quench of the Kondo coupling. For relaxation processes close to thermal equilibrium (after a weak perturbation), the relaxation time increases substantially as one crosses from the local moment regime into the heavy Fermi liquid. A strong perturbation, which injects a large amount of energy, can rapidly transform the heavy Fermi liquid into a local moment state. Upon cooling, the heavy Fermi liquid reappears in a two-stage relaxation, where the first step opens the Kondo gap and the second step corresponds to a slow approach of the equilibrium state via a nonthermal pathway.
Faculté des sciences et de médecine
Département de Physique
  • English
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