The theoretical understanding of the low-frequency modes in amorphous solids at finite temperature is still incomplete. The study of the relevant modes is obscured by the dressing of interparticle forces by collision-induced momentum transfer that is unavoidable at finite temperatures. Recently, it was proposed that low-frequency modes of vibrations around the thermally averaged configurations deserve special attention. In simple model glasses with bare binary interactions, these included quasilocalized modes whose density of states appears to be universal, depending on the frequencies as D(??) ??? ??4, in agreement with the similar law that is obtained with bare forces at zero temperature. In this paper, we report investigations of a model of silica glass at finite temperature; here the bare forces include binary and ternary interactions. Nevertheless, we can establish the validity of the universal law of the density of quasilocalized modes also in this richer and more realistic model glass.

Universal density of low-frequency states in silica glass at finite temperatures / R. Guerra, S. Bonfanti, I. Procaccia, S. Zapperi. - In: PHYSICAL REVIEW. E. - ISSN 2470-0053. - 105:5(2022), pp. 054104.1-054104.5. [10.1103/PhysRevE.105.054104]

Universal density of low-frequency states in silica glass at finite temperatures

R. Guerra
Primo
;
S. Bonfanti
Secondo
;
S. Zapperi
Ultimo
2022

Abstract

The theoretical understanding of the low-frequency modes in amorphous solids at finite temperature is still incomplete. The study of the relevant modes is obscured by the dressing of interparticle forces by collision-induced momentum transfer that is unavoidable at finite temperatures. Recently, it was proposed that low-frequency modes of vibrations around the thermally averaged configurations deserve special attention. In simple model glasses with bare binary interactions, these included quasilocalized modes whose density of states appears to be universal, depending on the frequencies as D(??) ??? ??4, in agreement with the similar law that is obtained with bare forces at zero temperature. In this paper, we report investigations of a model of silica glass at finite temperature; here the bare forces include binary and ternary interactions. Nevertheless, we can establish the validity of the universal law of the density of quasilocalized modes also in this richer and more realistic model glass.
Settore FIS/03 - Fisica della Materia
PSRL321RGUER_01 - Piano Sviluppo Unimi - Linea 3 - Bando SOE 2020 - Progetto TEQUAD - GUERRA, ROBERTO - PSR_LINEA3_ / Piano di sviluppo di ricerca - Bando SoE-SEED- Linea 3 - 2021
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/941032
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