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Effect of a Brownian Sublattice on Polariton Dispersion
Author(s) -
Merten L.,
Andrade P. Da R.
Publication year - 1974
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220620234
Subject(s) - polariton , dispersion relation , perturbation (astronomy) , physics , dispersion (optics) , brownian motion , quantum electrodynamics , statistical physics , condensed matter physics , quantum mechanics
A set of coupled equations describing the effect of a disorder mechanism on polariton dispersion is given. The treatment differs from that one finds in the literature because the disorder mechanism is not taken as a second‐order perturbation. A particular solution of these coupled equations shows that all originally undamped polaritons become damped waves. They all shift in frequency. Physical properties of different wave types in an order‐disorder crystal are discussed. For the complex frequencies of the coupled waves a modified Kurosawa relation and a modified LST relation is valid. Numerical evaluations of this model shall be given in a forthcoming paper.