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Title: Mechanical disorder of sticky-sphere glasses. I. Effect of attractive interactions
Authors: González-López, Karina
Shivam, Mahajan
Zheng, Yuanjian
Ciamarra, Massimo Pica
Lerner, Edan
Keywords: Science::Physics
Issue Date: 2021
Source: González-López, K., Shivam, M., Zheng, Y., Ciamarra, M. P. & Lerner, E. (2021). Mechanical disorder of sticky-sphere glasses. I. Effect of attractive interactions. Physical Review E, 103(2), 022605-.
Project: MOE2017-T2-1-066 (S)
Journal: Physical Review E 
Abstract: Recent literature indicates that attractive interactions between particles of a dense liquid play a secondary role in determining its bulk mechanical properties. Here we show that, in contrast with their apparent unimportance to the bulk mechanics of dense liquids, attractive interactions can have a major effect on macro- and microscopic elastic properties of glassy solids. We study several broadly applicable dimensionless measures of stability and mechanical disorder in simple computer glasses, in which the relative strength of attractive interactions—referred to as “glass stickiness”—can be readily tuned. We show that increasing glass stickiness can result in the decrease of various quantifiers of mechanical disorder, on both macro- and microscopic scales, with a pair of intriguing exceptions to this rule. Interestingly, in some cases strong attractions can lead to a reduction of the number density of soft, quasilocalized modes, by up to an order of magnitude, and to a substantial decrease in their core size, similar to the effects of thermal annealing on elasticity observed in recent works. Contrary to the behavior of canonical glass models, we provide compelling evidence indicating that the stabilization mechanism in our sticky-sphere glasses stems predominantly from the self-organized depletion of interactions featuring large, negative stiffnesses. Finally, we establish a fundamental link between macroscopic and microscopic quantifiers of mechanical disorder, which we motivate via scaling arguments. Future research directions are discussed.
ISSN: 2470-0045
DOI: 10.1103/PhysRevE.103.022605
Rights: © 2021 American Physical Society (APS). All rights reserved. This paper was published in Physical Review E and is made available with permission of American Physical Society (APS).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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