Theory for Photoinduced Phase Transition Dynamics in Molecular Low-Dimensional Conductors

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Mechanisms for photoinduced and ultrafast modulation of transport, dielectric, and magnetic properties of molecule-based materials are theoretically clarified. We describe how frozen electrons in insulators are melted by photoirradiation and become itinerant. The obtained results explain experimentally observed behaviors from the early stage to picoseconds timescales. Roles of couplings to lattice phonons and to molecular vibrations are clarified in strongly correlated electron systems. In addition, we propose a method for nonequilibrium steady states by which electronic orders and nonlinear transport properties are self-consistently described. The rectification behavior depends on the mechanism by which the material becomes an insulator. The mechanism responsible for the dielectric breakdown depends on the system size.