Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Physical review letters, 2013-03, Vol.110 (10), p.106401-106401, Article 106401

Ort / Verlag

United States

Erscheinungsjahr

2013

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• The terahertz response in 10-100 cm(-1) was investigated in an organic dimer-Mott (DM) insulator κ-(ET)(2)Cu(2)(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)(2)Cu(2)(CN)(3) reflect an instability near the boundary between the DM-ferroelectric charge ordered phases.