Using inelastic neutron scattering and molecular dynamics simulations on a model Zr-Cu-Al metallic glass, we show that transverse phonons persist well into the high-frequency regime, and can be detected at large momentum transfer. Furthermore, the apparent peak width of the transverse phonons was found to follow the static structure factor. The one-to-one correspondence, which was demonstrated for both Zr-Cu-Al metallic glass and a 3-dimensional Lennard-Jones model glass, suggests a universal correlation between the phonon dynamics and the underlying disordered structure. This remarkable correlation, not found for longitudinal phonons, underscores the key role that transverse phonons hold for understanding the structure-dynamics relationship in disordered materials.
@article{arxiv.2006.04369,
title = {Observation of High-frequency Transverse Phonons in Metallic Glasses},
author = {Xiyang Li and Huaping Zhang and Si Lan and Douglas L. Abernathy and Toshiya Otomo and Fangwei Wang and Yang Ren and Maozhi Li and Xun-Li. Wang},
journal= {arXiv preprint arXiv:2006.04369},
year = {2020}
}