Acoustic attenuation in glasses and its relation with the boson peak

Details Acoustic attenuation in glasses and its relation with the boson peak Acoustic attenuation in glasses and its relation with the boson peak

2007-01-05

arxiv.org/abs/cond-mat/0701112v1

Physics

Condensed Matter

Materials Science

To appear on PRL

Scientific paper

A theory for the vibrational dynamics in disordered solids [W. Schirmacher, Europhys. Lett. {\bf 73}, 892 (2006)], based on the random spatial variation of the shear modulus, has been applied to determine the wavevector ($k$) dependence of the Brillouin peak position ($\Omega_k)$ and width ($\Gamma_k$), as well as the density of vibrational states ($g(\omega)$), in disordered systems. As a result, we give a firm theoretical ground to the ubiquitous $k^2$ dependence of $\Gamma_k$ observed in glasses. Moreover, we derive a quantitative relation between the excess of the density of states (the boson peak) and $\Gamma_k$, two quantities that were not considered related before. The successful comparison of this relation with the outcome of experiments and numerical simulations gives further support to the theory.

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