Photoinduced charge and spin dynamics in strongly correlated electron systems

Motivated by the photoinduced phase transition in perovskite manganites, we examine charge and spin dynamics induced by photoirradiation. We calculate the transient optical absorption spectra of the extended double-exchange model by the density matrix renormalization group method. A charge-ordered insulator (COI) becomes metallic just after photoirradiation, and the metallic state tends to recover the initial COL This recovery is accompanied by the suppression of an antiferromagnetic correlation in the COI and is remarkable near a phase boundary in the ground state. We discuss the implications of the recent pump-probe reflection and magneto-optical Kerr spectroscopy data.