Ultrafast X射线散射在Weyl电荷密度波材料（Tase $ _4 $）中揭示复合振幅集体模式

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Ultrafast X射线散射在Weyl电荷密度波材料（Tase $ _4 $）中揭示复合振幅集体模式

Ultrafast x-ray scattering reveals composite amplitude collective mode in the Weyl charge density wave material (TaSe$_4$)$_2$I

论文作者

Nguyen, Quynh L., Duncan, Ryan A., Orenstein, Gal, Huang, Yijing, Krapivin, Viktor, de la Pena, Gilberto, Ornelas-Skarin, Chance, Reis, David A., Abbamonte, Peter, Bettler, Simon, Chollet, Matthieu, Hoffmann, Matthias C., Hurley, Matthew, Kim, Soyeun, Kirchmann, Patrick S., Kubota, Yuya, Mahmood, Fahad, Miller, Alexander, Osaka, Taito, Qu, Kejian, Sato, Takahiro, Shoemaker, Daniel P., Sirica, Nicholas, Song, Sanghoon, Stanton, Jade, Teitelbaum, Samuel W., Tilton, Sean E., Togashi, Tadashi, Zhu, Diling, Trigo, Mariano

论文摘要

我们报告了带有飞秒红外线激光脉冲的光激发后，我们报告了准充电密度波（CDW）材料（Tase $ _4 $）的超快X射线散射实验（Tase $ _4 $）。从CDW边带的时间依赖性衍射信号中，我们确定主要来自CDW静态失真的横向声学成分的振幅模式。这种声学振幅模式的动力学通过一个置换激发的模型很好地描述了，我们将其解释为通过与与TA链四链相关的光学声子组件耦合介导的。

We report ultrafast x-ray scattering experiments of the quasi-1D charge density wave (CDW) material (TaSe$_4$)$_2$I following photoexcitation with femtosecond infrared laser pulses. From the time-dependent diffraction signal at the CDW sidebands we identify an amplitude mode derived primarily from the transverse acoustic component of the CDW static distortion. The dynamics of this acoustic amplitude mode are described well by a model of a displacive excitation, which we interpret as mediated through a coupling to the optical phonon component associated with the tetramerization of the Ta chains.

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