Theory for Photoinduced Phase Transition Dynamics in Molecular Low-Dimensional Conductors

从理论上阐明了分子基材料的输运、介电和磁性能的光致和超快调制机制。我们描述了绝缘体中的冷冻电子是如何被光照射融化而变得流动的。所得结果解释了从早期到皮秒时间尺度的实验观察行为。阐明了在强相关电子系统中晶格声子和分子振动耦合的作用。此外，我们提出了一种非平衡稳态的方法，该方法可以自洽地描述电子阶数和非线性输运性质。整流行为取决于材料成为绝缘体的机制。造成电介质击穿的机制取决于系统的尺寸。

Mechanisms for photoinduced and ultrafast modulation of transport, dielectric, and magnetic properties of molecule-based materials are theoretically clarified. We describe how frozen electrons in insulators are melted by photoirradiation and become itinerant. The obtained results explain experimentally observed behaviors from the early stage to picoseconds timescales. Roles of couplings to lattice phonons and to molecular vibrations are clarified in strongly correlated electron systems. In addition, we propose a method for nonequilibrium steady states by which electronic orders and nonlinear transport properties are self-consistently described. The rectification behavior depends on the mechanism by which the material becomes an insulator. The mechanism responsible for the dielectric breakdown depends on the system size.