Numerical Study of the Structural and Thermal Properties of Vitreous Silica

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• We do find (like other authors [3]) an excess of modes at low frequencies compared with the Debye formula when diagonalizing the dynamical matrix. However the maximum of this excess of modes is located at a frequency of about 2THz, i.e., almost twice the experimental value. We think that this discrepancy is simply due to finite size effects: by reducing the lowest frequency ω 0 one would shift this maximum excess of modes to lower frequencies
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