Low-frequency vibrations of jammed packings in large spatial dimensions

Masanari Shimada , Hideyuki Mizuno , Ludovic Berthier (1) , Atsushi Ikeda

1 L2C - Laboratoire Charles Coulomb

Amorphous packings prepared in the vicinity of the jamming transition play a central role in theoretical studies of the vibrational spectrum of glasses. Two mean-field theories predict that the vibrational density of states $g(\omega)$ obeys a characteristic power law, $g(\omega)\sim\omega^2$, called the non-Debye scaling in the low-frequency region. Numerical studies have however reported that this scaling breaks down at low frequencies, due to finite dimensional effects. In this study, we prepare amorphous packings of up to $128000$ particles in spatial dimensions from $d=3$ to $d=9$ to characterise the range of validity of the non-Debye scaling. Our numerical results suggest that the non-Debye scaling is obeyed down to a frequency that gradually decreases as $d$ increases, and possibly vanishes for large $d$, in agreement with mean-field predictions. We also show that the prestress is an efficient control parameter to quantitatively compare packings across different spatial dimensions.

Domaines: Matière Molle [cond-mat.soft]; Systèmes désordonnés et réseaux de neurones [cond-mat.dis-nn]

Masanari Shimada, Hideyuki Mizuno, Ludovic Berthier, Atsushi Ikeda. Low-frequency vibrations of jammed packings in large spatial dimensions. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2020, pp.052906. ⟨10.1103/PhysRevE.101.052906⟩. ⟨hal-02880594⟩