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Updated: Oct 13, 2025
08:55
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
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Bond-space operator disentangles quasilocalized and phononic modes in structural glasses
Julia A Giannini1,2, David Richard1,3, M Lisa Manning1,2
1Department of Physics, Syracuse University, Syracuse, New York 13244, USA.
Physical Review. E
|November 16, 2021
Summary
Localized structural instabilities, or quasilocalized modes (QLMs), explain glass properties. A new bond-force operator reveals QLM features, overcoming limitations of previous vibrational spectrum analysis.
Area of Science:
- Condensed matter physics
- Materials science
- Computational materials science
Background:
- Emergent mechanical and dynamical properties of structural glasses are often linked to quasilocalized modes (QLMs).
- Traditional analysis of QLMs in glasses using vibrational spectra has limitations, including system-size effects and hybridization with phononic excitations.
Purpose of the Study:
- To overcome limitations in analyzing quasilocalized modes (QLMs) in structural glasses.
- To introduce a novel approach using a bond-force-response operator for QLM characterization.
- To investigate the dependence of QLM properties on material preparation protocols.
Main Methods:
- Developed and applied a linear operator defined on the space of particle interactions (bonds) in disordered materials.
- Analyzed the spectrum of this bond-force-response operator.
- Investigated the statistical and structural features of QLMs derived from this new operator.
Main Results:
- The bond-force-response operator provides a new interpretation of QLMs in glasses.
- This method cleanly recovers key statistical and structural features of QLMs.
- The study reveals how QLM density and spatial extent depend on annealing protocols.
Conclusions:
- The bond-force-response operator is a powerful tool for understanding QLMs in glasses, overcoming previous analytical limitations.
- This approach offers insights into the relationship between material preparation and emergent properties.
- Future research can extend this method to explore other aspects of disordered materials.
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