Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-07-06
J. Phys.: Conf. Ser. 148, 012058 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
3pages, 1 figure, Proceedings of Yamada Conference LXIII on Photo-induced Phase Transitions and Cooperative Phenomena (PIPT 20
Scientific paper
We investigate a photoinduced insulator-metal transition in the Falicov-Kimball model with the dynamical mean-field theory (DMFT) extended to nonequilibrium systems in periodic modulations in time. When the photon energy of the pump light is $\Omega \approx U$ ($U$: the interaction strength), a Drude-like peak is found to grow in the optical conductivity spectrum, which is an evidence that the system is driven into a metallic state. During the transition, the band gap does not collapse, whereas the distribution function exhibits a non-monotonic behaviour away from the Fermi distribution. This indicates that the transition cannot be accounted for by heating effects, but creation of photo-carriers is responsible.
Aoki Hideo
Oka Takashi
Tsuji Naoto
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