Road of warm dense noble metals to the plasma state: Ab initio theory of the ultrafast structural dynamics in warm dense matter
Road of warm dense noble metals to the plasma state: Ab initio theory of the ultrafast structural dynamics in warm dense matter
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DOI：
10.1103/physrevb.89.100301
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发表时间：
2014-03-03
影响因子：
3.7
通讯作者：
Garcia, Martin E.
中科院分区：
文献类型：
--
作者：
Kabeer, Fairoja Cheenicode;Zijlstra, Eeuwe S.;Garcia, Martin E.
强烈的超短极紫外 (XUV) 脉冲可用于在实验室中制造温暖的致密物质，然后将其发展为等离子体状态。然而，到目前为止，尚不清楚这种转变是通过从热电子到冷原子的热传递还是由于晶格不稳定性而以非热方式发生。在这里，我们计算了铜和银的声子光谱对 XUV 激发的核心空穴和核心空穴与非常热的电子的存在的响应。我们发现平均原子间键在温暖的致密状态下变得更强。我们讨论为什么这些发现支持上述传热场景。
Intense ultrashort extreme ultraviolet (XUV) pulses can be used to create warm dense matter in the laboratory, which then develops to a plasma state. So far, however, it is unknown, whether this transition occurs via heat transfer from hot electrons to cold atoms or nonthermally due to a lattice instability. Here we computed the response of the phonon spectra of copper and silver to the presence of XUV-excited core holes and core holes together with very hot electrons. We found that the average interatomic bonds become stronger in the warm dense state. We discuss why these findings support the above-mentioned heat transfer scenario.