Emergence and Evolution of the k Gap in Spectra of Liquid and Supercritical States.
Emergence and Evolution of the k Gap in Spectra of Liquid and Supercritical States.
复制标题
液体和超临界态光谱中 k 带隙的出现和演化。
DOI：
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发表时间：
2017
影响因子：
8.6
通讯作者：
K. Trachenko
中科院分区：
文献类型：
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作者：
C. Yang;Martin T. Dove;V. Brazhkin;K. Trachenko
对强相互作用系统的基本理解必然涉及集体模式，但在动态无序和强相互作用系统（如液体和超临界流体）中，它们的性质和演化通常不被理解。我们报告了广泛的分子动力学模拟的结果，并提供了直接的证据，证明液体在互反空间中的类固体横向光谱中形成一个间隙，在零和阈值之间没有传播模式。除了液体状态，这一结果也重要地适用于物质的超临界状态。我们证明了新出现的间隙随着液体弛豫时间的逆增加而增加，并讨论了间隙如何影响液体和超临界态的性质。
Fundamental understanding of strongly interacting systems necessarily involves collective modes, but their nature and evolution is not generally understood in dynamically disordered and strongly interacting systems such as liquids and supercritical fluids. We report the results of extensive molecular dynamics simulations and provide direct evidence that liquids develop a gap in a solidlike transverse spectrum in the reciprocal space, with no propagating modes between zero and a threshold value. In addition to the liquid state, this result importantly applies to the supercritical state of matter. We show that the emerging gap increases with the inverse of liquid relaxation time and discuss how the gap affects properties of liquid and supercritical states.