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Microscopic observation of two-level systems in a metallic glass model

Year: 2022
Type: preprint
Abstract: The low-temperature quasi-universal behavior of amorphous solids has been attributed to the existence of spatially-localized tunneling defects found in the low-energy regions of the potential energy landscape. Computational models of glasses can be studied to elucidate the microscopic nature of these defects. Recent simulation work has demonstrated the means of generating stable glassy configurations for models that mimic metallic glasses using the swap Monte Carlo algorithm. Building on these studies, we present an extensive exploration of the glassy metabasins of the potential energy landscape of a variant of the most widely used model of metallic glasses. We carefully identify tunneling defects and reveal their depletion with increased glass stability. The density of tunneling defects near the experimental glass transition temperature appears to be in good agreement with experimental measurements.
DOI: 10.48550/arxiv.2209.09579
Authors: Mocanu, Felix C., Berthier, Ludovic, Ciarella, Simone, Khomenko, Dmytro, Reichman, David R., Scalliet, Camille, Zamponi, Francesco
Institutions: École Normale Supérieure - PSL, Laboratoire de Physique de l'Ecole Normale Supérieure, Centre National de la Recherche Scientifique, Université de Montpellier, University of Cambridge, Laboratoire Charles Coulomb, Columbia University, Sapienza University of Rome, Sorbonne Université
Language: English
Open Access status: green
OpenAlex ID: W4296596293
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