Collective charge excitation and ultrafast optical responses in organic electron dielectrics

• IWAI Shinichiro

  Department of Physics, Tohoku University Japan Science and Technology Agency (JST)-Core Research for Evolutional Science and Technology (CREST)

Bibliographic Information

Other Title

• テラヘルツ光でみる有機電子誘電体の電荷集団励起と超高速光応答
• テラヘルツ ヒカリ デ ミル ユウキ デンシ ユウデンタイ ノ デンカ シュウダンレイキ ト チョウコウソク ヒカリ オウトウ

Abstract

The terahertz (THz) response in the range of 10-100 cm^-1 was investigated in an organic dimer-Mott (DM) insulator κ-(BEDT-TTF)₂Cu₂(CN)₃ that exhibits a relaxor-like dielectric anomaly. The ≤30 cm^-1 band in the optical conductivity was attributable to the collective excitation of the intra-dimer electric dipoles which are formed by an electron correlation. We succeeded in observing a photo-induced enhancement of this ~30cm^-1 band, reflecting the growth of the electric dipole glass in the DM phase. Such optical responses in κ-(BEDT-TTF)₂Cu₂(CN)₃ reflect instability near the boundary between the DM-ferroelectric charge ordered phases.

Journal

• Oyo Buturi

  Oyo Buturi 83 (6), 452-455, 2014-06-10

  The Japan Society of Applied Physics

Keywords

• terahertz spectroscopy
• organic conductors
• strongly correlated system
• charge order
• photoinduced phase transition

Details

• CRID: 1390564227310802944
• NII Article ID: 130007718611
• NII Book ID: AN00026679
• DOI: 10.11470/oubutsu.83.6_452
• ISSN: 21882290
• ISSN: 03698009
• NDL BIB ID: 025571136
• Web Site: http://id.ndl.go.jp/bib/025571136
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I025571136
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed