Excess Vibrational Modes and the Boson Peak in Model Glasses

2006/11/17 by Ning Xu, Matthieu Wyart, Andrea J. Liu +1 · 4 citations
Materials Science · Physics and Astronomy · #Glass properties and applications #Material Dynamics and Properties #Phase-change materials and chalcogenides #cond-mat.soft

paper · pdf · doi:10.1103/physrevlett.98.175502

published as Physical Review Letters 98, 175502 (2007) · 4 pages, 3 figures, submitted to Physical Review Letters

arxiv created 2006/11/17 · openalex publication_date 2007/04/24 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The excess low-frequency normal modes for two widely used models of glasses are studied at zero temperature. The onset frequencies for the anomalous modes for both systems agree well with predictions of a variational argument, which is based on analyzing the vibrational energy originating from the excess contacts per particle over the minimum number needed for mechanical stability. Even though both glasses studied have a high coordination number, most of the additional contacts can be considered to be weak.

Citations

• Jamming at zero temperature and zero applied stress: The epitome of disorder

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