Raman Scattering Due to Disorder-Induced Polaritons

Details Raman Scattering Due to Disorder-Induced Polaritons Raman Scattering Due to Disorder-Induced Polaritons

1998-10-20

arxiv.org/abs/cond-mat/9810248v2

Physics

Condensed Matter

Disordered Systems and Neural Networks

LaTex2e format using ams packages; 20 pages, 2 eps figures; added aditional discussion of the results from the point of view o

Scientific paper

The selection rules for dipole and Raman activity can be relaxed due to local distortion of a crystalline structure. In this situation a dipole-inactive mode can become simultaneously active in Raman scattering and in dipole interaction with the electromagnetic field. The later interaction results in disorder-induced polaritons, which could be observed in first-order Raman spectra. We calculate scattering cross-section in the case of a material with a diamond-like average structure, and show that there exist a strong possibility of observing the disorder induced polaritons.

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