Condensed Matter > Disordered Systems and Neural Networks
[Submitted on 20 Sep 2022 (v1), last revised 4 Jan 2023 (this version, v3)]
Title:Microscopic observation of two-level systems in a metallic glass model
View PDFAbstract: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.
Submission history
From: Felix-Cosmin Mocanu [view email][v1] Tue, 20 Sep 2022 09:50:43 UTC (16,197 KB)
[v2] Sat, 1 Oct 2022 15:04:23 UTC (20,663 KB)
[v3] Wed, 4 Jan 2023 16:22:48 UTC (19,497 KB)
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