Okamoto H, Matsuzaki H, Wakabayashi T, Takahashi Y, Hasegawa T
Department of Advanced Materials Science, University of Tokyo, Kashiwa, 277-8561, Japan.
Phys Rev Lett. 2007 Jan 19;98(3):037401. doi: 10.1103/PhysRevLett.98.037401. Epub 2007 Jan 16.
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.
通过对有机电荷转移化合物双（乙撑二硫）四硫富瓦烯 - 二氟四氰基喹啉二甲烷（ET - F2TCNQ）进行飞秒泵浦 - 探测反射光谱，研究了一维（1D）莫特绝缘体中的电荷动力学。对瞬态反射率变化的分析表明，光载流子掺杂诱导的低能光谱权重集中在与掺杂密度无关的德鲁德分量上，并且从未形成带隙中间态。这些现象可以用一维关联电子系统的自旋 - 电荷分离概念来解释。
