Optical Modulation of Effective On-Site Coulomb Energy for the Mott Transition in an Organic Dimer Insulator

Y. Kawakami, S. Iwai, T. Fukatsu, M. Miura, N. Yoneyama, T. Sasaki, and N. Kobayashi
Phys. Rev. Lett. 103, 066403 – Published 7 August 2009

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(BEDTTTF)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.

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  • Received 26 June 2009

DOI:https://doi.org/10.1103/PhysRevLett.103.066403

©2009 American Physical Society

Authors & Affiliations

Y. Kawakami1, S. Iwai1,2,*, T. Fukatsu1, M. Miura1, N. Yoneyama2,3, T. Sasaki2,3, and N. Kobayashi3

  • 1Department of Physics, Tohoku University, Sendai 980-8578, Japan
  • 2JST, CREST, Sendai 980-8578, Japan
  • 3Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

  • *s-iwai@m.tains.tohoku.ac.jp

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Vol. 103, Iss. 6 — 7 August 2009

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