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arXiv · 0903.2332

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

Naoto Tsuji·Takashi Oka·Hideo Aoki
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Abstract

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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Naoto Tsuji, Takashi Oka, Hideo Aoki. 2009-08-01. Nonequilibrium Steady State of Photoexcited Correlated Electrons in the Presence of Dissipation. https://doi.org/10.1103/physrevlett.103.047403

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