Universal Features of Terahertz Absorption in Disordered Materials

Abstract

Using an analytical theory, experimental terahertz time-domain spectroscopy data and numerical evidence, we demonstrate that the frequency dependence of the absorption coupling coefficient between far-infrared photons and atomic vibrations in disordered materials has the universal functional form, C(omega) = A + B*omega^2, where the material-specific constants A and B are related to the distributions of fluctuating charges obeying global and local charge neutrality, respectively.

5 pages, 3 figs

References in corpus (3)

• Glass-specific behavior in the damping of acoustic-like vibrations
• Simulation of the physical properties of the chalcogenide glass As${}_2$S${}_3$ using a density-functional-based tight-binding method
• Vibrational properties of the one-component $\sigma$ phase

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• Vibrational behaviour of a realistic amorphous-silicon model
• Atomic-charge distribution in glasses by terahertz spectroscopy
• Physics of Phonon-Polaritons in Amorphous Materials