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We have demonstrated transient charge localization effects with a drivinghigh-frequency field of 7-fs, 1.5-cycle near infrared light in correlatedorganic conductors. In a layered organic conductor alpha-(BEDT-TTF)2I3(BEDT-TTF: bis[ethylenedithio]-tetrathiafulvalene), a transient short-rangecharge order (CO) state is induced in a metallic phase. In contrast to suchdrastic change in the electronic state from the metal to the transient CO inalpha-(BEDT-TTF)2I3, dynamics of a field-induced reduction of a transferintegral are captured as a red shift of the plasma-like reflectivity edge in aquasi-one-dimensional organic conductor (TMTTF)2AsF6 (TMTTF:tetramethyltetrathiafulvalene). These studies on the field-induced chargelocalization have been motivated by the theory of dynamical localization on thebasis of tight-binding models with no electron correlation under a strongcontinuous field. However, the results of pump-probe transient reflectivitymeasurements using nearly single-cycle 7-fs, 11 MV/cm pulses and thetheoretical studies which are presented in this review indicate that the pulsedfield contributes to the similar phenomenon with the help of a characteristiclattice structure and Coulomb repulsion.

Strong light-field effects driven by nearly single-cycle 7-fs light field in correlated organic conductors