Universal Features of Terahertz Absorption in Disordered Materials

Details Universal Features of Terahertz Absorption in Disordered Materials Universal Features of Terahertz Absorption in Disordered Materials

2006-04-07

arxiv.org/abs/cond-mat/0604205v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

5 pages, 3 figs

Scientific paper

10.1103/PhysRevLett.97.055504

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.

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