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 and Shinichiro Iwai ()
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Takahiro Ishikawa: Tohoku University
Yuto Sagae: Tohoku University
Yota Naitoh: Tohoku University
Yohei Kawakami: Tohoku University
Hirotake Itoh: Tohoku University
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

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms6528

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