Collective excitation of an electric dipole on a molecular dimer in an organic dimer-Mott insulator

K. Itoh; H. Itoh; M. Naka; S. Saito; I. Hosako; N. Yoneyama; S. Ishihara; T. Sasaki; S. Iwai

doi:10.1103/PhysRevLett.110.106401

Collective excitation of an electric dipole on a molecular dimer in an organic dimer-Mott insulator

K. Itoh, H. Itoh, M. Naka, S. Saito, I. Hosako, N. Yoneyama, S. Ishihara, T. Sasaki, S. Iwai

Research output: Contribution to journal › Article › peer-review

45 Citations (Scopus)

Abstract

The terahertz response in 10-100 cm^-1 was investigated in an organic dimer-Mott (DM) insulator κ-(ET)₂Cu₂(CN) ₃ that exhibits a relaxorlike dielectric anomaly. An ∼30 cm ^-1 band in the optical conductivity was attributable to collective excitation of the fluctuating intradimer electric dipoles that 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 κ-(ET) ₂Cu₂(CN)₃ reflect an instability near the boundary between the DM-ferroelectric charge ordered phases.

Original language	English
Article number	106401
Journal	Physical Review Letters
Volume	110
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevLett.110.106401
Publication status	Published - 2013 Mar 6
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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abstract = "The terahertz response in 10-100 cm-1 was investigated in an organic dimer-Mott (DM) insulator κ-(ET)2Cu2(CN) 3 that exhibits a relaxorlike dielectric anomaly. An ∼30 cm -1 band in the optical conductivity was attributable to collective excitation of the fluctuating intradimer electric dipoles that 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 κ-(ET) 2Cu2(CN)3 reflect an instability near the boundary between the DM-ferroelectric charge ordered phases.",

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T1 - Collective excitation of an electric dipole on a molecular dimer in an organic dimer-Mott insulator

AU - Itoh, K.

AU - Itoh, H.

AU - Naka, M.

AU - Saito, S.

AU - Hosako, I.

AU - Yoneyama, N.

AU - Ishihara, S.

AU - Sasaki, T.

AU - Iwai, S.

PY - 2013/3/6

Y1 - 2013/3/6

N2 - The terahertz response in 10-100 cm-1 was investigated in an organic dimer-Mott (DM) insulator κ-(ET)2Cu2(CN) 3 that exhibits a relaxorlike dielectric anomaly. An ∼30 cm -1 band in the optical conductivity was attributable to collective excitation of the fluctuating intradimer electric dipoles that 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 κ-(ET) 2Cu2(CN)3 reflect an instability near the boundary between the DM-ferroelectric charge ordered phases.

AB - The terahertz response in 10-100 cm-1 was investigated in an organic dimer-Mott (DM) insulator κ-(ET)2Cu2(CN) 3 that exhibits a relaxorlike dielectric anomaly. An ∼30 cm -1 band in the optical conductivity was attributable to collective excitation of the fluctuating intradimer electric dipoles that 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 κ-(ET) 2Cu2(CN)3 reflect an instability near the boundary between the DM-ferroelectric charge ordered phases.

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