Collective excitations in dynamics of liquids: a "toy" dynamical model for binary mixtures

被引：2
作者：
Bryk, T.
Mryglod, I. M.
机构：
[1] Natl Acad Sci Ukraine, Inst Condensed Matter Phys, UA-79011 Lvov, Ukraine
[2] Natl Tech Univ Lviv, Inst Appl Math & Fundamental Sci, UA-79013 Lvov, Ukraine
来源：
LOW TEMPERATURE PHYSICS | 2007年 / 33卷 / 09期
关键词：
D O I：
10.1063/1.2781507
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We propose a new "toy" dynamical model that permits us to derive analytical expressions for dispersion of two branches of "bare" propagating collective excitations in binary disordered systems in the whole range of wave numbers. These expressions are used for the analysis of dependence of dispersion curves on mass ratio and concentration at fixed density of the system. An effect of hybridization of two branches is discussed in terms of mode contributions to time correlation functions. This allows us to estimate the regions with dominant types of coherent or partial dynamics. (c) 2007 American Institute of Physics.
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页码：790 / 796
页数：7
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