Collective excitation of electric dipole on molecular dimer in organic dimer-Mott insulator
Abstract
The terahertz (THz) response in 10-100 cm-1 was investigated in an organic dimer-Mott (DM) insulator kappa-(ET)2Cu2(CN)3 that exhibits a relaxor-like dielectric anomaly. 30 cm-1 band in the optical conductivity was attributable to collective excitation of the intra-dimer electric dipoles which are formed by an electron correlation. We succeeded in observing photoinduced enhancement of this 30 cm-1 band, reflecting the growth of the electric dipole cluster in the DM phase. Such optical responses in kappa-(ET)2Cu2(CN)3 reflect instability near the boundary between the DM-ferroelectric charge ordered phases.
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