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

We have demonstrated transient charge localization effects with a driving high-frequency field of 7 fs, 1.5-cycle near-infrared light in correlated organic conductors. In a layered organic conductor α-(BEDT-TTF)₂I₃ (BEDT-TTF: bis[ethylenedithio]-tetrathiafulvalene), a transient short-range charge order (CO) state is induced in a metallic phase. In contrast to such drastic change in the electronic state from the metal to the transient CO in α-(BEDT-TTF)₂I₃, dynamics of a field-induced reduction of a transfer integral are captured as a red-shift of the plasma-like reflectivity edge in a quasi-one-dimensional organic conductor (TMTTF)₂AsF₆ (TMTTF: tetramethyltetrathiafulvalene). These studies on the field-induced charge localization have been motivated by the theory of dynamical localization on the basis of tight-binding models with no electron correlation under a strong continuous field. However, the results of pump-probe transient reflectivity measurements using nearly single-cycle 7 fs, 11 MV cm^-1 pulses and the theoretical studies which are presented in this review indicate that the pulsed field contributes to the similar phenomenon with the help of a characteristic lattice structure and Coulomb repulsion.