Optical freezing of charge motion in an organic conductor

Takahiro Ishikawa, Yuto Sagae, Yota Naitoh, Yohei Kawakami, Hirotake Itoh, Kaoru Yamamoto, Kyuya Yakushi, Hideo Kishida, Takahiko Sasaki, Sumio Ishihara, Yasuhiro Tanaka, Kenji Yonemitsu, Shinichiro Iwai

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Dynamical localization, that is, reduction of the intersite electronic transfer integral t by an alternating electric field, E(ω), is a promising strategy for controlling strongly correlated systems with a competing energy balance between t and the Coulomb repulsion energy. Here we describe a charge localization induced by the 9.3 MV cm-1 instantaneous electric field of a 1.5 cycle (7 fs) infrared pulse in an organic conductor α-(bis[ethylenedithio]-tetrathiafulvalene)2I3. A large reflectivity change of >25% and a coherent charge oscillation along the time axis reflect the opening of the charge ordering gap in the metallic phase. This optical freezing of charges, which is the reverse of the photoinduced melting of electronic orders, is attributed to the ∼10% reduction of t driven by the strong, high-frequency (ω≥ t/H) electric field.

Original languageEnglish
Article number5528
JournalNature communications
Volume5
DOIs
Publication statusPublished - 2014

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Ishikawa, T., Sagae, Y., Naitoh, Y., Kawakami, Y., Itoh, H., Yamamoto, K., Yakushi, K., Kishida, H., Sasaki, T., Ishihara, S., Tanaka, Y., Yonemitsu, K., & Iwai, S. (2014). Optical freezing of charge motion in an organic conductor. Nature communications, 5, [5528]. https://doi.org/10.1038/ncomms6528