Active control of photoinduced phase transition

本研究的目的是控制强相关分子晶体的主动光致相变，其在超快光开关器件中的应用有望实现。为此，我开发了各种类型的时间分辨光谱系统，范围从10 fs到100 ps，并发现了仅由光激发产生的准稳定状态和从电子相变到晶格相变的时间延迟。此外，我成功地发现了通过改变激发光子密度、相干声子和电子相干性来主动控制光致相变的现象。

The aim of this study is to control actively photoinduced phase transition in strongly correlated molecular crystals, whose applications to ultrafast optical switching devices are expected. For this purpose, I developed various types of time-resolved spectroscopic system over a range from 10 fs to 100 ps, and found the quasi-stable state only created by photo-excitation and the time delay from electronic phase transition to lattice phase transition. In addition, I succeeded in finding the phenomena that photoinduced phase transition can be controlled actively through variation of excitation photon-density, coherent phonon, and electronic coherence.