Atomistic study of two-level systems in amorphous silica

T. Damart and D. Rodney
Phys. Rev. B 97, 014201 – Published 8 January 2018

Abstract

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.

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  • Received 5 October 2017

DOI:https://doi.org/10.1103/PhysRevB.97.014201

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

T. Damart and D. Rodney

  • Institut Lumière Matière, UMR 5306 Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne, France

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Issue

Vol. 97, Iss. 1 — 1 January 2018

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