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Testing the heterogeneous-elasticity theory for low-energy excitations in structural glasses
Edan Lerner1, Eran Bouchbinder2
1University of Amsterdam, Institute of Theoretical Physics, Science Park 904, 1098 XH Amsterdam, The Netherlands.
Physical Review. E
|February 20, 2025
Summary
This study tested a new theory for low-energy excitations in structural glasses. Computer simulations found that the heterogeneous elasticity theory (HET) does not accurately predict the behavior of these excitations.
Area of Science:
- Condensed matter physics
- Materials science
- Statistical mechanics
Background:
- Structural glasses exhibit low-energy nonphononic excitations crucial for their properties.
- A well-founded theory for these excitations and their spectra is currently lacking.
- Recent heterogeneous elasticity theory (HET) offers predictions for these excitations.
Purpose of the Study:
- To quantitatively test the predictions of the heterogeneous elasticity theory (HET) for low-energy excitations in structural glasses.
- To investigate the scaling of the nonphononic spectrum, mode localization, and connections to glass formation history and stress distributions.
Main Methods:
- Utilized computer models of structural glasses.
- Performed quantitative testing of HET predictions.
Main Results:
- The study's findings do not support the predictions made by HET.
- Discrepancies were observed in the predicted nature and statistics of low-energy excitations.
Conclusions:
- The heterogeneous elasticity theory (HET) requires further development to accurately describe low-energy excitations in glasses.
- Additional theoretical advancements are needed to understand these fundamental properties of glasses.
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