Nonequilibrium Steady State of Photoexcited Correlated Electrons in the Presence of Dissipation

Details Nonequilibrium Steady State of Photoexcited Correlated Electrons in the Presence of Dissipation Nonequilibrium Steady State of Photoexcited Correlated Electrons in the Presence of Dissipation

2009-03-13

arxiv.org/abs/0903.2332v2

Phys. Rev. Lett. 103, 047403 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures, published version

Scientific paper

10.1103/PhysRevLett.103.047403

We present a framework to determine nonequilibrium steady states in strongly correlated electron systems in the presence of dissipation. This is demonstrated for a correlated electron (Falicov-Kimball) model attached to a heat bath and irradiated by an intense pump light, for which an exact solution is obtained with the Floquet method combined with the nonequilibrium dynamical mean-field theory. On top of a Drude-like peak indicative of photometallization as observed in recent pump-probe experiments, new nonequilibrium phenomena are predicted to emerge, where the optical conductivity exhibits dip and kink structures around the frequency of the pump light, a midgap absorption arising from photoinduced Floquet subbands, and a negative attenuation (gain) due to a population inversion.

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