Photoinduced Growth of Ferroelectric Charge Order in Organic Dimer-Mott insulator
1 Department of Physics, Tohoku University, Sendai 980-8578, Japan
2 JST, CREST, Sendai 980-8578, Japan
3 National Institute of Information and Communications Technology, Koganei, 184-8795, Japan
4 Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan
a e-mail: email@example.com
Layered triangular organic dimer Mott (DM) insulator κ-(ET)2Cu2(CN)3 was shown to exhibit a relaxor-like dielectric anomaly below 40 K with strong dispersion relation, reflecting its electric dipole glass (ferroelectric charge order; FCO) nature[1, 2]. The dielectric anomaly in κ-(ET)2Cu2(CN)3 indicates that this compound is located in the vicinity of the DM-FCO phase boundary, where ferroelectric fluctuation such as the electric dipole glass state or the polar cluster is formed in the DM phase. Optical excitation of the DM-FCO competing state by an ultrashort light pulse enables us to achieve dramatic responses, such as photoinduced ferroelectricity, photoinduced growth of the electric dipole glass or the polar clusters.
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