发表机构
Institute of Physics, Kazan Federal University（喀山联邦大学物理研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究基于自洽弛豫理论确定Yukawa流体Frenkel线的状态参数，证实其可通过静态结构因子直接确定，并解释了该线附近旋子极小值频率的物理意义。
AI 中文摘要
针对简单模型流体Yukawa流体，定义了被称为Frenkel线的动力学交叉条件，该条件与纵向类声激发色散关系中的旋子极小值仅在粒子集体振动动力学主导液体时存在这一事实相关。基于Yukawa流体的自洽弛豫理论，确定了旋子极小值消失的热力学状态，所得Frenkel线的状态参数值与通过分子动力学模拟确定Yukawa流体相图中该线位置的研究结果一致。研究表明，该系统中的Frenkel线可直接由结构特征——静态结构因子确定，同时提出了简单液体在Frenkel线附近旋子极小值频率的物理解释。
英文摘要
For a simple model fluid, the Yukawa fluid, the condition for dynamic crossover, known as the Frenkel line, is defined. The condition is related to the fact that the roton minimum in the dispersion relation of longitudinal acoustic-like excitations exists only when the collective vibrational dynamics of particles dominates in the liquid. Based on the self-consistent relaxation theory for the Yukawa fluid, thermodynamic states are determined in which the roton minimum disappears. The obtained values of the state parameters for the Frenkel line are consistent with the results of studies in which the position of this line on the phase diagram of the Yukawa fluid was determined using molecular dynamics simulations. It is shown that the Frenkel line in this system can be determined directly from the structural characteristic -- the static structure factor. A physical interpretation of the roton minimum frequency for the simple liquids near the Frenkel line is proposed.
Comments9 pages, 4 figures
Journal refJ. Phys.: Condens. Matter (2026)
