Motional narrowing effect in certain random binary lattices

Details Motional narrowing effect in certain random binary lattices Motional narrowing effect in certain random binary lattices

2000-07-17

arxiv.org/abs/cond-mat/0007269v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, REVTeX, 2 Postscript figures included. To appear in Physics Letters A

Scientific paper

10.1016/S0375-9601(00)00469-2

We present a model for a class of random binary lattices by introducing a one-dimensional system where impurities are placed in one sublattice while host atoms lie on the other sublattice. The source of disorder is the stochastic fluctuation of the impurity energy from site to site. We study the optical absorption spectra and the peculiarities of the motional narrowing effect at the band edges for perturbative and nonperturbative degrees of disorder. Analytical results agree well with numerical simulations.

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