Warm dense matter (WDM) is an exotic state on the border between condensed matter and dense plasmas. Important occurrences of WDM include dense astrophysical objects, matter in the core of our Earth, and matter produced in strong compression experiments. As of late, x‐ray Thomson scattering has become an advanced tool to diagnose WDM. The interpretation of the data requires model input for the dynamic structure factor S(q, ω) and the plasmon dispersion ω(q). Recently, the first ab initio results for S(q, ω) of the homogeneous warm dense electron gas were obtained from path integral Monte Carlo simulations (Dornheim et al., Phys. Rev. Lett., 121, 255001, 2018). Here, we analyse the effects of correlations and finite temperature on the dynamic dielectric function and the plasmon dispersion. Our results for the plasmon dispersion and damping differ significantly from the random‐phase approximation and from earlier models of the correlated electron gas. Moreover, we show when commonly used weak damping approximations break down and how the method of complex zeroes of the dielectric function can solve this problem for WDM conditions.

中文翻译：

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从头开始产生的结果是等离激元的弥散和热致密电子气的阻尼

热致密物质（WDM）是凝聚态物质与致密等离子体之间边界上的一种奇异状态。WDM的重要事件包括密集的天体物体，地球核心中的物质以及强压缩实验中产生的物质。最近，X射线Thomson散射已成为诊断WDM的高级工具。数据的解释需要模型输入动态结构因子S（q，  ω）和等离激元色散ω（q）。最近，S（q，  ω）的第一个从头算结果从路径积分蒙特卡罗模拟（Dornheim等人，Phys。Rev. Lett。，121，255001，2018）获得均匀均质温暖致密电子气。在这里，我们分析了相关性和有限温度对动态介电函数和等离子体激元色散的影响。我们对等离激元弥散和阻尼的结果与随机相位近似和相关电子气的早期模型有很大不同。此外，我们展示了常用的弱阻尼近似何时分解，介电函数的复零方法如何解决WDM条件下的这一问题。