Abstract
Glasses possess more low-frequency vibrational modes than predicted by Debye theory. These excess modes are crucial for the understanding of the low temperature thermal and mechanical properties of glasses, which differ from those of crystalline solids. Recent simulational studies suggest that the density of the excess modes scales with their frequency as in two and higher dimensions. Here, we present extensive numerical studies of two-dimensional model glass formers over a large range of glass stabilities. We find that the density of the excess modes follows up to around the boson peak, regardless of the glass stability. The stability dependence of the overall scale of correlates with the stability dependence of low-frequency sound attenuation. However, we also find that, in small systems, where the first sound mode is pushed to higher frequencies, at frequencies below the first sound mode, there are excess modes with a system size independent density of states that scales as .
- Received 14 July 2021
- Accepted 9 November 2021
DOI:https://doi.org/10.1103/PhysRevLett.127.248001
© 2021 American Physical Society
Physics Subject Headings (PhySH)
Erratum
Erratum: Low-Frequency Excess Vibrational Modes in Two-Dimensional Glasses [Phys. Rev. Lett. 127, 248001 (2021)]
Lijin Wang, Grzegorz Szamel, and Elijah Flenner
Phys. Rev. Lett. 129, 019901 (2022)
synopsis
Glassy Behavior Depends on Dimension
Published 7 December 2021
The number of excess vibrational modes in glasses scales differently in two dimensions than it does in three.
See more in Physics