Viscosity of metallic and model liquids is spectrally decomposed into contributions from unstable localized instantaneous normal modes above T_MC and stable modes below it, with a quantitative model proposed.
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The boson peak arises from accumulation of vibrational spectral weight in a narrow frequency window that is only weakly dependent on wavevector, manifesting as a flat band in the dynamical structure factor rather than a propagating excitation.
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Spectral Decomposition of Liquid Viscosity into Instantaneous Normal Modes
Viscosity of metallic and model liquids is spectrally decomposed into contributions from unstable localized instantaneous normal modes above T_MC and stable modes below it, with a quantitative model proposed.
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A flat-band perspective on the boson peak in amorphous solids
The boson peak arises from accumulation of vibrational spectral weight in a narrow frequency window that is only weakly dependent on wavevector, manifesting as a flat band in the dynamical structure factor rather than a propagating excitation.