二维经典库仑流体的集体模
Collective modes of two-dimensional classical Coulomb fluids
摘要：
利用分子动力学模拟详细研究了二维库仑流体在大范围耦合下的集体模谱。所得到的色散关系进行了比较与理论方法的基础上准晶体近似（QCA），也被称为准本地化电荷近似（QLCA）在等离子体相关的上下文中。一个整体令人满意的协议之间的理论和模拟记录的纵向模式在中等耦合和在长波长域在强耦合。对于横模，只有在很强的耦合，当截止波数低于剪切波不能传播变得很小时，在长波长域中才能达到令人满意的协议。得到了剪切波截止波数与耦合参数的关系。
英文摘要：
Molecular dynamics simulations have been performed to investigate in detail collective modes spectra of two-dimensional Coulomb fluids in a wide range of coupling. The obtained dispersion relations are compared with theoretical approaches based on quasi-crystalline approximation (QCA), also known as the quasi-localized charge approximation (QLCA) in the plasma-related context. An overall satisfactory agreement between theory and simulations is documented for the longitudinal mode at moderate coupling and in the long-wavelength domain at strong coupling. For the transverse mode, satisfactory agreement in the long-wavelength domain is only reached at very strong coupling, when the cutoff wave-number below which shear waves cannot propagate becomes small. The dependence of the cutoff wave-number for shear waves on the coupling parameter is obtained.
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