Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-07-06
J. Phys.: Conf. Ser. 150, 042216 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 3 figures, Proceedings of LT25
Scientific paper
In order to investigate photoinduced insulator-metal transitions observed in correlated electron systems, we propose a new theoretical method, where we combine a Floquet-matrix method for AC-driven systems with the dynamical mean-field theory. The method can treat nonequilibrium steady states exactly beyond the linear-response regime. We have applied the method to the Falicov-Kimball model coupled to AC electric fields, and numerically obtained the spectral function, the nonequilibrium distribution function and the current-voltage characteristic. The results show that intense AC fields indeed drive Mott-like insulating states into photoinduced metallic states in a nonlinear way.
Aoki Hideo
Oka Takashi
Tsuji Naoto
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