Localized low-frequency vibrational modes in a simple model glass

作者：Brian B. Laird, H. R. Schober · 发表于：Physical Review Letters · 年份：1991 · DOI：10.1103/physrevlett.66.636 · 被引用次数：282 · 研究领域：Spectroscopy and Quantum Chemical Studies、Quantum optics and atomic interactions、Material Dynamics and Properties

We examine the vibrational spectrum of a glass of soft spheres produced by quenching an equilibrated liquid (produced via constant-energy molecular-dynamics simulation) to zero temperature. Normal-mode analysis shows clearly the existence of (quasi)localized modes at the low-frequency end of the vibrational spectrum. The modes are found to be localized around atoms whose neighborhood structure differs significantly from the average glass environment. The effective masses of these modes range upwards from 10 atomic masses.