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Updated: May 6, 2026

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

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Published on: October 9, 2012

在半导体中的非热融,以 femtosecond 分辨率测量

A Rousse¹, C Rischel, S Fourmaux

¹Laboratoire d'Optique Appliquée, ENSTA, CNRS UMR7639, Ecole Polytechnique, Chemin de la Hunière, Palaiseau, France. rousse@enstay.ensta.fr

|March 10, 2001

概括

超快的X射线衍射揭示了半导体融化发生在femtoseconds由于指导原子运动,而不是热能. 这种新技术在快速的非平衡过程中直接探测原子结构的变化.

科学领域:

材料科学材料科学材料科学
凝聚物质物理学凝聚物质物理学
物理化学物理化学

背景情况:

超快速光谱学揭示了由定向原子运动驱动的反应,与较慢,扩散过程不同.
理论上,半导体化是通过激光诱导的电子推进发生的,改变了原子间的力量,并启动了原子的快速运动.

研究的目的:

用超快速时间解析X射线衍射测量抗氧化物 (InSb) 的特征化时间.
在超快,非热相转换期间直接探测不断变化的原子结构.

主要方法:

使用了一种新的超快速时间解析的X射线衍射技术.
应用了该技术来研究激光诱导的InSb.化.

主要成果:

确定了InSb的特征性化时间,短至350 femtoseconds.
观察到一个明确的长距离原子秩序的损失,在晶体内延伸到900安格斯特.
通过结构分析证明了通过结构分析来定量表征非热过程的能力.

结论:

该研究提供了通过电子激发驱动的半导体中超快速化的直接结构证据.
开发的X射线衍射方法为研究各种科学学科的超快动态提供了强大的工具.

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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