Enhanced vibrational stability in glass droplets.

Autor:	Chakraborty S; Tata Institute of Fundamental Research, Hyderabad, 500046 Telangana, India., Krishnan VV; Tata Institute of Fundamental Research, Hyderabad, 500046 Telangana, India., Ramola K; Tata Institute of Fundamental Research, Hyderabad, 500046 Telangana, India., Karmakar S; Tata Institute of Fundamental Research, Hyderabad, 500046 Telangana, India.
Jazyk:	angličtina
Zdroj:	PNAS nexus [PNAS Nexus] 2023 Sep 05; Vol. 2 (9), pp. pgad289. Date of Electronic Publication: 2023 Sep 05 (Print Publication: 2023).
DOI:	10.1093/pnasnexus/pgad289
Abstrakt:	We show through simulations of amorphous solids prepared in open-boundary conditions that they possess significantly fewer low-frequency vibrational modes compared to their periodic boundary counterparts. Specifically, using measurements of the vibrational density of states, we find that the D ( ω ) ∼ ω 4 law changes to D ( ω ) ∼ ω δ with δ ≈ 5 in two dimensions and δ ≈ 4.5 in three dimensions. Crucially, this enhanced stability is achieved when utilizing slow annealing protocols to generate solid configurations. We perform an anharmonic analysis of the minima corresponding to the lowest frequency modes in such open-boundary systems and discuss their correlation with the density of states. A study of various system sizes further reveals that small systems display a higher degree of localization in vibrations. Lastly, we confine open-boundary solids in order to introduce macroscopic stresses in the system, which are absent in the unconfined system and find that the D ( ω ) ∼ ω 4 behavior is recovered. (© The Author(s) 2023. Published by Oxford University Press on behalf of National Academy of Sciences.)
Databáze:	MEDLINE
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