Optical modulation of effective on-site coulomb energy for the Mott transition in an organic dimer insulator

Yohei Kawakami, Shinichiro Iwai, T. Fukatsu, M. Miura, N. Yoneyama, Takahiko Sasaki, N. Kobayashi

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)

Abstract

We report an optical modulation of the effective on-site Coulomb energy U on a dimer (Udimer) for achieving the Mott insulator-to-metal transition in κ-(BEDT-TTF)2Cu[N(CN)2]Br, as investigated by pump-probe spectroscopy. A reduction of Udimer is optically induced by molecule displacement in the dimer under intradimer excitation. The mechanism of this metallization differs greatly from the photodoping-type mechanism reported previously. In contrast, a faster transition via the photodoping mechanism is detected for interdimer excitation. A metallic-domain-wall oscillation originating from the modulation of Udimer was also observed near the critical end point of the Mott transition line.

Original languageEnglish
Article number066403
JournalPhysical Review Letters
Volume103
Issue number6
DOIs
Publication statusPublished - 2009 Aug 7

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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