Photoinduced Metallic State Mediated by Spin-Charge Separation in a One-Dimensional Organic Mott Insulator

H. Okamoto, H. Matsuzaki, T. Wakabayashi, Y. Takahashi, and T. Hasegawa
Phys. Rev. Lett. 98, 037401 – Published 16 January 2007

Abstract

Charge dynamics in a one-dimensional (1D) Mott insulator was investigated by fs pump-probe reflection spectroscopy on an organic charge-transfer compound, bis(ethylenedithio)tetrathiafulvalene-difluorotetracyanoquinodimethane (ETF2TCNQ). The analyses of the transient reflectivity changes demonstrate that low-energy spectral weight induced by photocarrier doping is concentrated on a Drude component being independent of the doping density, and midgap state is never formed. Such phenomena can be explained by the concept of spin-charge separation characteristic of 1D correlated electron systems.

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  • Received 7 August 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.037401

©2007 American Physical Society

Authors & Affiliations

H. Okamoto1,2,3, H. Matsuzaki1,3, T. Wakabayashi1, Y. Takahashi2, and T. Hasegawa2

  • 1Department of Advanced Materials Science, University of Tokyo, Kashiwa, 277-8561, Japan
  • 2Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8562, Japan
  • 3CREST, JST, Kawaguchi 332-0012, Japan

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Issue

Vol. 98, Iss. 3 — 19 January 2007

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