飞秒
材料科学
电子衍射
衍射
电子
金属
金属键合
X射线晶体学
结晶学
光电子学
光学
化学
激光器
物理
冶金
核物理学
作者
Jingjun Li,Luye Yue,Zijing Chen,Dao Xiang,Jianming Cao
摘要
Rhenium disulfide with a distorted crystal structure has recently attracted tremendous attention for its excitonic and highly anisotropic properties. While ultrafast spectroscopies have extensively probed the carrier response to photoexcitation, the associated lattice response has remained elusive. In this study, we utilize MeV femtosecond electron diffraction to unravel the intricate dynamics of lattice responses and energy flow post-photoexcitation. Combining with structure factor calculations, our investigation reveals the dominance of photoinduced shortening in the Re–Re metallic bond, driven by the strong electron–phonon coupling via the Ag8 mode, resulting in an anisotropic intensity change of Bragg reflections within the initial 0.2 ps. Subsequent stretching of the metallic bond, coupled with the concurrent lattice thermalization, enables the system to reach a new equilibrium within 20 ps. This comprehensive understanding of lattice responses in a nonequilibrium state provides unique insights into photoinduced dynamics in 1T′-ReS2 from a structural perspective.
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