Ultrafast primary process of photo-induced N-I transition and macroscopic oscillation of domain boundary in TTF-CA

S. Iwai, S. Tanaka, K. Fujinuma, H. Kishida, H. Okamoto, Y. Tokura

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Initial dynamics of photo-induced ionic (I) to neutral (N) phase transition in tetrathiafulvalene-p-chloranil (TTF-CA) was investigated by femtosecond reflection spectroscopy with various excitation intensities. A charge transfer excitation in the I phase produces N donor (D0)-acceptor (A 0) strings within 2 ps. For a weak excitation intensity, these initial N states decay with a life time of 300 ps at 4 K., but rather multiply leading to macroscopic I-N conversion within 20 ps at 77 K just below the N-I transition temperature TNI. Near TNI, we also found the coherent motion of the macroscopic N-I domain boundary with a period of 85 ps.

Original languageEnglish
Pages (from-to)807-813
Number of pages7
JournalPhase Transitions
Volume75
Issue number7-8
DOIs
Publication statusPublished - 2002 Jan 1
Externally publishedYes

Keywords

  • Charge transfer complex
  • Coherent motion
  • Neutral-Ionic domain wall
  • Photo-induced phase transition
  • Ultrafast phenomena

ASJC Scopus subject areas

  • Instrumentation
  • Materials Science(all)

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