Berlin 2008 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 6: Glasses I (joint session DF/DY)

DF 6.8: Vortrag

Dienstag, 26. Februar 2008, 11:30–11:45, EB 407

Raman scattering in glasses and the boson peak — •Bernhard Schmid¹ and Walter Schirmacher² — ¹FB Physik, Univ. Mainz — ²Phys.-Dept. TU München

Vibrational spectra of glasses as measured e.g. by inelastic neutron scattering exhibit at low frequencies (∼ 1THz) an enhancement over Debye’s ω² law (“boson peak”). Using a theory of light scattering from disordered materials developed recently [1,2], we show that the anomalous low-frequency Raman spectra observed in this frequency regime are not proportional to the density of states (as was widely believed) but are related to the disorder-induced self-energy function. The latter, in turn, can be related to the width of the Brillouin line in the same frequency regime.

[1] B. Schmid, Diploma thesis, TU München, 2007

[2] B. Schmid and W. Schirmacher, to be published