Collective Excitation of an Electric Dipole on a Molecular Dimer in an Organic Dimer-Mott Insulator
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説明
The terahertz (THz) response in 10-100 cm^-1 was investigated in an organic dimer-Mott (DM) insulator kappa-(ET)_2Cu_2(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)_2Cu_2(CN)_3 reflect instability near the boundary between the DM-ferroelectric charge ordered phases.
15 pages, 4 figures, Accepted Phys. Rev. Lett. Jan. 16, 2013
収録刊行物
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- Physical Review Letters
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Physical Review Letters 110 (10), 106401-, 2013-03-06
American Physical Society (APS)
