Ultrafast optical responses in one-dimensional Mott insulators of halogen-bridged Ni compounds

S. Tao, T. Miyagoe, H. Matsuzaki, H. Ohtsu, M. Hasegawa, S. Takaishi, M. Yamashita, H. Okamoto

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Halogen-bridged nickel compounds have attracted much attention because they show large optical nonlinearity and photoinduced insulator-metal transition. We report a new fabrication method for thin film samples of the Ni compounds. Using these thin film samples, we have performed femtosecond pump-probe spectroscopy. Photomodulated absorption induced by resonant and nonresonant photoexcitation on charge-transfer band have revealed that excitons decay very fast with the time constant τ less than 2 picoseconds and charge carriers decay relatively slow with τ > 20 ps. The slower decay of the charge carriers is attributable to the formation of polarons and the resultant decrease of their mobility.

Original languageEnglish
Article number012011
JournalJournal of Physics: Conference Series
Volume148
DOIs
Publication statusPublished - 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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