Relationship between the boson peak and first sharp diffraction peak in glasses
Abstract
Boson peak (BP) dynamics refers to the universal excitation in the terahertz region of glass. In this study, the universal dynamics of BP were quantitatively evaluated in various glassy materials based on the heterogeneous elasticity theory (HET), and the determinants of BP were successfully extracted. A strong correlation was observed between the maximum possible coarse-graining wavenumber, which is a determinant of the BP in the HET, and the first sharp diffraction peak (FSDP) wavenumber, which is a characteristic index of the medium-range order in glasses. The results indicate that the behaviour of BP in glass can be quantitatively understood in the following two steps. First, the FSDP representing the largest structural correlation in glass is dominantly used to determine the unit size of the elastic modulus heterogeneity, and second, the magnitude of the elastic modulus fluctuation is used to determine the frequency and intensity of the BP.
Keywords
Cite
@article{arxiv.2501.05782,
title = {Relationship between the boson peak and first sharp diffraction peak in glasses},
author = {Dan Kyotani and Soo Han Oh and Suguru Kitani and Yasuhiro Fujii and Hiroyuki Hijiya and Hideyuki Mizuno and Shinji Kohara and Akitoshi Koreeda and Atsunobu Masuno and Hitoshi Kawaji and Seiji Kojima and Yohei Yamamoto and Tatsuya Mori},
journal= {arXiv preprint arXiv:2501.05782},
year = {2025}
}