Abstract
Layered triangular organic dimer Mott (DM) insulator κ -(ET)2 Cu2 (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)2 Cu2 (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.
Highlights
In strongly correlated electron systems, the dipole field induced by the Coulomb repulsion interaction sometimes shows ferroelectricity and ferroelectric fluctuation such as the electric dipole glass state or a polar nano region (PNR)
The dielectric anomaly in -(ET)2Cu2(CN)3 indicates that this compound is located in the vicinity of the Dimer Mott (DM)-Ferroelectric Charge Order (FCO) phase boundary, where the electric dipole glass state or the PNR is formed in the DM phase
Considering that, the marked increase in the 1 THz band at
Summary
In strongly correlated electron systems, the dipole field induced by the Coulomb repulsion interaction sometimes shows ferroelectricity and ferroelectric fluctuation such as the electric dipole glass state or a polar nano region (PNR). An origin of the spinliquid phase has been reconsidered, i.e., this compound was shown to exhibit a DM phase (a) and FCO phase (b) are shown. The dielectric anomaly in -(ET)2Cu2(CN) indicates that this compound is located in the vicinity of the DM-FCO phase boundary (red area in Fig. 1), where the electric dipole glass state or the PNR is formed in the DM phase. In such a DM-FCO competing state, optical excitation of the DM-FCO competing state by an ultrashort light pulse enables us to achieve dramatic responses, such as photoinduced ferroelecricity, photoinduced growth of the electric dipole glass or the PNR
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