Atomistic study of two-level systems in amorphous silica
| Autor: | David Rodney, Tanguy Damart |
|---|---|
| Přispěvatelé: | Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2018 |
| Předmět: |
[PHYS]Physics [physics]
Materials science media_common.quotation_subject Sampling (statistics) 02 engineering and technology Molecular dynamics Deformation (meteorology) Dissipation 021001 nanoscience & nanotechnology 01 natural sciences Asymmetry Mechanical & acoustical properties Amorphous materials [SPI]Engineering Sciences [physics] Transverse plane 0103 physical sciences [CHIM]Chemical Sciences Statistical physics Amorphous silica Thin film 010306 general physics 0210 nano-technology Energy (signal processing) media_common |
| Zdroj: | Physical Review B: Condensed Matter and Materials Physics (1998-2015) Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2018, 97 (1), pp.014201. ⟨10.1103/PhysRevB.97.014201⟩ |
| ISSN: | 2469-9969 2469-9950 1098-0121 1550-235X |
| Popis: | International audience; Internal friction is analyzed in an atomic-scale model of amorphous silica. The potential energy landscape of more than 100 glasses is explored to identify a sample of about 700 two-level systems (TLSs). We discuss the properties of TLSs, particularly their energy asymmetry and barrier as well as their deformation potential, computed as longitudinal and transverse averages of the full deformation potential tensors. The discrete sampling is used to predict dissipation in the classical regime. Comparison with experimental data shows a better agreement with poorly relaxed thin films than well relaxed vitreous silica, as expected from the large quench rates used to produce numerical glasses. The TLSs are categorized in three types that are shown to affect dissipation in different temperature ranges. The sampling is also used to discuss critically the usual approximations employed in the literature to represent the statistical properties of TLSs. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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