Emergence of two-level systems in glass formers: a kinetic Monte Carlo study

Gao, Xin-Yuan, Deng, Hai-Yao ORCID: https://orcid.org/0000-0001-6065-483X, Lee, Chun-Shing, You, Jian-Qiang and Lam, Chi-Hang 2022. Emergence of two-level systems in glass formers: a kinetic Monte Carlo study. Soft Matter 11 , pp. 2211-2221. 10.1039/D1SM01809D

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Abstract

Using a distinguishable-particle lattice model based on void-induced dynamics, we successfully reproduce the well-known linear relation between heat capacity and temperature at very low temperatures. The heat capacity is dominated by two-level systems formed due to the strong localization of voids to two neighboring sites, and can be exactly calculated in the limit of ultrastable glasses. Similar but weaker localization at higher temperatures accounts for glass transition. The result supports the conventional two-level tunneling picture by revealing how two-level systems emerge from random particle interactions, which also cause glass transition. Our approach provides a unified framework for relating microscopic dynamics of glasses at room and cryogenic temperatures.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	Royal Society of Chemistry
ISSN:	1744-683X
Date of First Compliant Deposit:	8 March 2022
Date of Acceptance:	16 February 2022
Last Modified:	18 Nov 2023 21:45
URI:	https://orca.cardiff.ac.uk/id/eprint/147821

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