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Enumerating low-frequency nonphononic vibrations in computer glasses.

Edan Lerner¹, Avraham Moriel², Eran Bouchbinder³

¹Institute of Theoretical Physics, University of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands.

The Journal of Chemical Physics

|July 1, 2024

Summary

This summary is machine-generated.

Structural glasses possess unique "excess modes" beyond standard phonons. A new method simplifies their identification and analysis in computer models, revealing universal spectral properties.

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Area of Science:

Condensed matter physics
Materials science
Computational materials science

Background:

Structural glasses exhibit low-frequency vibrational modes beyond generic Goldstone phonons.
These
excess modes
have been difficult to study due to hybridization with phononic excitations.

Purpose of the Study:

To present a straightforward method for enumerating nonphononic modes in computer glasses.
To analyze the statistical properties and spectral contribution of these excess modes.

Main Methods:

Utilizing the relationship DG(ω)=D(ω)-DD(ω) to isolate the nonphononic contribution DG(ω) from the total spectrum D(ω).
Analyzing computer-generated glass models to identify and quantify nonphononic modes.

Main Results:

Nonphononic modes contribute additively to the vibrational spectrum, even with strong hybridization.
The universal DG(ω)∼ω4 power-law tail of the nonphononic spectrum is clearly revealed.
The method facilitates quantitative analysis of nonphononic contributions.

Conclusions:

The developed scheme effectively enumerates nonphononic modes in computer glasses.
This approach enables further investigation into the universal properties of excess modes.
The findings pave the way for analyzing experimental vibrational spectra of glasses.