发表刊物：Phys. Rev. B

摘要：It has been technically challenging to concurrently probe the electrons and the lattices in materials during nonequilibrium processes, allowing their correlations to be determined. Here, in a single set of ultrafast electron diffraction patterns taken on the charge-density-wave (CDW) material 1T -TaSeTe, we discover a temporal shift in the diffraction intensity measurements as a function of scattering angle. With the help of dynamic models and theoretical calculations, we show that the ultrafast electrons probe both the valence-electron and lattice dynamic processes, resulting in the temporal shift measurements. Our results demonstrate unambiguously that the CDW is not merely a result of the periodic lattice deformation ever present in 1T -TaSeTe but has significant electronic origin. This method demonstrates an approach for studying many novel properties that arise from electron-lattice dephasing in molecules and crystals for next-generation devices.

合写作者：Li, J.; Li, J.; Sun, K.; Wu, L.; Li, R.; Yang, J.; Shen, X.; Wang, X.; Luo, H.; Cava, R. J.; Robinson, I. K.; Jin, X.; Yin, W-G.; Zhu, Y.; and Tao J

论文类型：期刊论文

卷号：101,

页面范围：100304 (R)

是否译文：否

发表时间：2020-08-04

发布期刊链接：https://doi.org/10.1103/PhysRevB.101.100304