在GdTe3中超出平衡的电荷密度波段过渡的时间解析结构动力学
I Gonzalez-Vallejo, V L R Jacques1, D Boschetto2
1LPS, Université Paris Saclay, CNRS, Orsay, France.
Structural dynamics (Melville, N.Y.)
|December 25, 2023
概括
超快电子衍射揭示了光刺激触发了GdTe3.3中的非热电荷密度波 (CDW) 阶段过渡. CDW抑制和恢复动态受到初始温度和事件流动的强烈影响.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 超快速光谱法 超快速光谱法
背景情况:
- 像GdTe3这样的近二维材料表现出独特的电荷密度波 (CDW) 状态.
- 了解非平衡条件下的CDW相变的动态对于材料科学至关重要.
研究的目的:
- 用超快电子衍射研究GdTe3中电荷密度波 (CDW) 阶段过渡的失平衡动态.
- 为了确定事件流动和初始样本温度对CDW动态和恢复的影响.
主要方法:
- 使用超快电子衍射探测GdTe3.3中的CDW动态.
- 在不同的事件流动和在过渡温度以下的初始温度下进行实验.
- 估计的内在晶体温度使用Debye-Waller因子从布拉格峰值强度.
主要成果:
- 在失衡条件下,光刺激会在GdTe3中诱导超快的非热相转换.
- 晶体温度稳定在6 psi的范围内.
- 电荷密度波抑制发生在小于一皮秒的时间内,恢复时间随着事件流动和初始温度线性增加.
- 在相关材料中观察到的过渡性CDW阶段在GdTe3.3中没有检测到.
结论:
- 在GdTe3中电荷密度波过渡的动态显著依赖于初始样本温度.
- 这项研究提供了关于准二维材料中非平衡相位过渡机制的见解.
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