Motional narrowing effect in certain random binary lattices

Abstract

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.

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

References in corpus (4)

• Experimental evidence of delocalized states in random dimer superlattices
• Linear optical properties of one-dimensional Frenkel exciton systems with intersite energy correlations
• Motional narrowing effect in one-dimensional Frenkel chains with configurational disorder
• Delocalization of states in two component superlattices with correlated disorder