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

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H. Okamoto,^1,2,3 H. Matsuzaki,^1,3 T. Wakabayashi,¹ Y. Takahashi,² 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

Received 7 August 2006; published 16 January 2007

Chargedynamics in a one-dimensional (1D) Mott insulator was investigated byfs pump-probe reflection spectroscopy on an organic charge-transfer compound, bis(ethylenedithio)tetrathiafulvalene-difluorotetracyanoquinodimethane(ET-F₂TCNQ). The analyses of the transient reflectivity changes demonstrate thatlow-energy spectral weight induced by photocarrier doping is concentrated ona Drude component being independent of the doping density, andmidgap state is never formed. Such phenomena can be explainedby the concept of spin-charge separation characteristic of 1D correlatedelectron systems.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.98.037401
DOI:	10.1103/PhysRevLett.98.037401
PACS:	78.47.+p; 71.30.+h; 78.20.Ci; 78.40.Me 78.47.+p Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter 71.30.+h Metal–insulator transitions and other electronic transitions 78.20.Ci Optical constants including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity 78.40.Me Visible and ultraviolet spectra of organic compounds and polymers YEAR: 2007