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arXiv 2104.00523physics.plasm-ph
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强耦合下等离子体响应函数的反常行为

Anomalous behavior of plasma response functions at strong coupling

Péter Magyar, Gabor J. Kalman, Peter Hartmann, Zoltán Donkó

摘要:

利用平衡分子动力学计算机模拟的数据,我们已经建立了一个目录的库仑单组分等离子体(OCP)在广泛的$Γ$耦合值,包括强耦合$Γ> 1$液体制度的响应函数。我们专注于域的负压缩性($Γ>3$),因果关系和伴随的Kramers-Kronig关系被违反。我们给出了一个描述的细节的违反,在频域和时域。我们表明,粘弹性极点的密度响应函数变形成一个假想的极点在上$ω$半平面,负责在这个耦合范围内的响应的异常行为。通过研究等离子体激元色散关系,通过介电响应函数,而不是通过动态结构函数的峰值,我们得到了一个更可靠的表示的色散。我们证明,有一个密切的联系之间的形成的Roton最小的分散体和系统的负压缩性。我们的分析扩展到一个短程相互作用的系统的可行性进行了探讨。

英文摘要:

Using data from equilibrium Molecular Dynamics computer simulations we have built up a catalogue of response functions for the Coulomb one-component plasma (OCP) over a wide range of $Γ$ coupling values, including the strongly coupled $Γ> 1$ liquid regime. We focus on the domain of negative compressibility ($Γ>3$), where causality and the concomitant Kramers-Kronig relations are violated. We give a description of the details of the violation, both in the frequency and time domains. We show that the viscoelastic pole of the density response function morphs into an imaginary pole in the upper $ω$ half-plane that is responsible for the anomalous behavior of the response in this coupling range. By examining the plasmon dispersion relation through the dielectric response function, rather than via the peaks of the dynamical structure function, we obtain a more reliable representation for the dispersion. We demonstrate that there is an intimate link between the formation of the roton minimum in the dispersion and the negative compressibility of the system. The feasibility of the extension of our analysis to systems with a short range interaction is explored.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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