Photo-induced insulator-metal transition in an organic conductor α-(BEDT-TTF)2I3

Naoya Tajima, Jun Ichi Fujisawa, Nobuko Nakay, Teruya Ishihara, Reizo Kato, Yutaka Nishio, Koji Kajita

Research output: Contribution to journalArticlepeer-review

71 Citations (Scopus)

Abstract

Photo-switching between a charge-ordered insulating (CO) state and a metallic (M) state has been successfully realized in an organic conductor α-(BEDT-TTF)2I3 at low temperatures. The large photocurrent induced by the pulsed laser excitation with a photon energy of 2.6 eV had two components. The fast-decaying component had a life time of 120 ns. The subsequent one rose slowly (after about 0.7 μs) and remained as long as an electric field above 470 V/cm was applied. The dependences of these two components on laser power, applied voltage, and the onset of pulsed voltage were examined. It has been clearly demonstrated that the second component has prominent thresholds for both laser power and voltage. For each component, the resistivity decreased by about seven orders of magnitude from about 4MΩ·cm to less than 0.4Ω·cm at 4K.

Original languageEnglish
Pages (from-to)511-514
Number of pages4
Journaljournal of the physical society of japan
Volume74
Issue number2
DOIs
Publication statusPublished - 2005 Feb 1
Externally publishedYes

Keywords

  • Charge-ordered insulating state
  • Photoconductivity
  • α-(BEDT-TTF)I

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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