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Optical freezing of charge motion in an organic conductor

Author

Listed:
  • Takahiro Ishikawa

    (Tohoku University)

  • Yuto Sagae

    (Tohoku University)

  • Yota Naitoh

    (Tohoku University)

  • Yohei Kawakami

    (Tohoku University)

  • Hirotake Itoh

    (Tohoku University
    Japan Science and Technology Agency, CREST)

  • Kaoru Yamamoto

    (Okayama Science University)

  • Kyuya Yakushi

    (Toyota Physical and Chemical Research Institute)

  • Hideo Kishida

    (Nagoya University)

  • Takahiko Sasaki

    (Institute for Materials Research, Tohoku University)

  • Sumio Ishihara

    (Tohoku University)

  • Yasuhiro Tanaka

    (Chuo University)

  • Kenji Yonemitsu

    (Chuo University)

  • Shinichiro Iwai

    (Tohoku University
    Japan Science and Technology Agency, CREST)

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/ħ) electric field.

Suggested Citation

  • Takahiro Ishikawa & Yuto Sagae & Yota Naitoh & Yohei Kawakami & Hirotake Itoh & Kaoru Yamamoto & Kyuya Yakushi & Hideo Kishida & Takahiko Sasaki & Sumio Ishihara & Yasuhiro Tanaka & Kenji Yonemitsu & , 2014. "Optical freezing of charge motion in an organic conductor," Nature Communications, Nature, vol. 5(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6528
    DOI: 10.1038/ncomms6528
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