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Nonthermal Steady States after an Interaction Quench in the Falicov-Kimball Model

2008; American Physical Society; Volume: 100; Issue: 12 Linguagem: Inglês

10.1103/physrevlett.100.120404

1092-0145

Martin Eckstein, Marcus Kollar,

Theoretical and Computational Physics

We present the exact solution of the Falicov-Kimball model after a sudden change of its interaction parameter using nonequilibrium dynamical mean-field theory. For different interaction quenches between the homogeneous metallic and insulating phases the system relaxes to a nonthermal steady state on time scales on the order of variant Planck's over 2pi/bandwidth, showing collapse and revival with an approximate period of h/interaction if the interaction is large. We discuss the reasons for this behavior and provide a statistical description of the final steady state by means of generalized Gibbs ensembles.