Impact of elastic heterogeneity on the propagation of vibrations at finite temperatures in glasses
| Autor: | Mizuno, Mossa |
|---|---|
| Přispěvatelé: | Laboratoire Interdisciplinaire de Physique [Saint Martin d’Hères] (LIPhy), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), University of Tokio, European Synchrotron Radiation Facility (ESRF) |
| Rok vydání: | 2019 |
| Předmět: |
Condensed Matter - Materials Science
Materials science Physics and Astronomy (miscellaneous) Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Disordered Systems and Neural Networks (cond-mat.dis-nn) 02 engineering and technology Mechanics Condensed Matter - Soft Condensed Matter Condensed Matter - Disordered Systems and Neural Networks 021001 nanoscience & nanotechnology Condensed Matter Physics amorphous materials 01 natural sciences molecular dynamics lcsh:QC1-999 Vibration quasiparticles and collective excitations 0103 physical sciences [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] Soft Condensed Matter (cond-mat.soft) 010306 general physics 0210 nano-technology ComputingMilieux_MISCELLANEOUS lcsh:Physics |
| Zdroj: | 'Condensed Matter Physics ', vol: 22, pages: 43604-1-43604-14 (2019) Condensed Matter Physics, Vol 22, Iss 4, p 43604 (2019) Condensed Matter Physics Condensed Matter Physics, Institute for Condensed Matter Physics, 2019, 22 (4), pp.43604. ⟨10.5488/CMP.22.43604⟩ |
| ISSN: | 2224-9079 1607-324X |
| DOI: | 10.5488/cmp.22.43604 |
| Popis: | Some aspects of how sound waves travel through disordered solids are still unclear. Recent work has characterized a feature of disordered solids which seems to influence vibrational excitations at the mesoscales, local elastic heterogeneity. Sound waves propagation has been demonstrated to be strongly affected by inhomogeneous mechanical features of the materials which add to the standard anharmonic couplings, amounting to extremely complex transport properties at finite temperatures. Here, we address these issues for the case of a simple atomic glass former, by Molecular Dynamics computer simulation. In particular, we focus on the transverse components of the vibrational excitations in terms of dynamic structure factors, and characterize the temperature dependence of sound dispersion and attenuation in an extended frequency range. We provide a complete picture of how elastic heterogeneity determines transport of vibrational excitations, also based on a direct comparison of the numerical data with the predictions of the heterogeneous elastic theory. Comment: 14 pages, 5 figures, 1 table |
| Databáze: | OpenAIRE |
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