绝热过程
声速
波数
物理
横截面
色散关系
微粒电浆
等离子体
横波
机械
波传播
光学
声学
热力学
量子力学
结构工程
工程类
作者
Zhenyu Ge,Hui Dong,Shaoyu Lü,Liang Chen,Matteo Baggioli,Yan Feng
出处
期刊:Physical review
日期:2023-05-22
卷期号:107 (5)
标识
DOI:10.1103/physreve.107.055211
摘要
Equilibrium molecular dynamics simulations are performed to study two-dimensional (2D) dusty plasma liquids. Based on the stochastic thermal motion of simulated particles, the longitudinal and transverse phonon spectra are calculated, and used to determine the corresponding dispersion relations. From there, the longitudinal and transverse sound speeds of 2D dusty plasma liquids are obtained. It is discovered that, for wavenumbers beyond the hydrodynamic regime, the longitudinal sound speed of a 2D dusty plasma liquid exceeds its adiabatic value, i.e., the so-called fast sound. This phenomenon appears at roughly the same length scale of the cutoff wavenumber for transverse waves, confirming its relation to the emergent solidity of liquids in the nonhydrodynamic regime. Using the thermodynamic and transport coefficients extracted from the previous studies, and relying on the Frenkel theory, the ratio of the longitudinal to the adiabatic sound speeds is derived analytically, providing the optimal conditions for fast sound, which are in quantitative agreement with the current simulation results.
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