title: Photoinduced metallic state mediated by spin-charge separation in a one-dimensional organic Mott insulator.
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 (ET-F2TCNQ). 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.
authors.affiliation: Department of Advanced Materials Science, University of Tokyo, Kashiwa, 277-8561, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Okamoto
authors.forename: H
authors.initials: H
authors.lastname: Matsuzaki
authors.forename: T
authors.initials: T
authors.lastname: Wakabayashi
authors.forename: Y
authors.initials: Y
authors.lastname: Takahashi
authors.forename: T
authors.initials: T
authors.lastname: Hasegawa