Low-frequency atomic motion in a model glass

被引：109

作者：

Mazzacurati, V

Ruocco, G

Sampoli, M

机构：

[1] UNIV FLORENCE,DIPARTIMENTO ENERGET,I-50139 FLORENCE,ITALY

[2] INFM,I-16152 GENOA,ITALY

来源：

EUROPHYSICS LETTERS | 1996年 / 34卷 / 09期

关键词：

D O I：

10.1209/epl/i1996-00515-8

中图分类号：

O4 [物理学];

学科分类号：

0702 [物理学];

摘要：

A molecular-dynamics simulation is presented which explores the microscopic dynamics of a monatomic model glass. The investigated systems consist of up to 32000 atoms interacting via a Lennard-Jones potential. The normal-modes analysis has been used to determine the pattern of atomic displacements. Except for the highest frequencies, all the vibrational modes are found to be delocalized. In the lowest-frequency region the pattern of atomic displacements associated with a given eigenmode is composed by an uncorrelated random component plus well-defined sinusoidal-like waves. The two components are of comparable amplitudes.

引用

页码：681 / 686

页数：6

共 18 条

[1]

ISOTHERMAL-ISOBARIC COMPUTER-SIMULATION OF THE SUPERCOOLED-LIQUID-GLASS TRANSITION REGION - IS THE SHORT-RANGE ORDER IN THE AMORPHOUS SOLID FCC [J].