Statistics and Properties of Low-Frequency Vibrational Modes in Structural Glasses

Edan Lerner, Gustavo During, Eran Bouchbinder

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Low-frequency vibrational modes play a central role in determining various basic properties of glasses, yet their statistical and mechanical properties are not fully understood. Using extensive numerical simulations of several model glasses in three dimensions, we show that in systems of linear size L sufficiently smaller than a crossover size L-D, the low-frequency tail of the density of states follows D(omega) similar to omega(4) up to the vicinity of the lowest Goldstone mode frequency. We find that the sample-to-sample statistics of the minimal vibrational frequency in systems of size L <L-D is Weibullian, with scaling exponents in excellent agreement with the omega(4) law. We further show that the lowest-frequency modes are spatially quasilocalized and that their localization and associated quartic anharmonicity are largely frequency independent. The effect of preparation protocols on the low-frequency modes is elucidated, and a number of glassy length scales are briefly discussed.
Original languageEnglish
Article number035501
Number of pages5
JournalPhysical review letters
Issue number3
StatePublished - 15 Jul 2016


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