Optical absorption in paired correlated random lattices

Details Optical absorption in paired correlated random lattices Optical absorption in paired correlated random lattices

1994-06-16

arxiv.org/abs/cond-mat/9406069v1

Physics

Condensed Matter

REVTeX 3.0, 8 pages, 4 figures available on request from FD-A (fimat02@emducms1.sis.ucm.es), Phys Rev B in press, MA/UC3M/01/9

Scientific paper

10.1103/PhysRevB.50.6453

Optical absorption in a random one-dimensional lattice in the presence of paired correlated disorder is studied. The absorption line shape is evaluated by solving the microscopic equations of motion of the Frenkel-exciton problem in the lattice. We find that paired correlation causes the occurrence of well-defined characteristic lines in the absorption spectra which clearly differ from the case of unpaired correlation. The behavior of the absorption lines as a function of defect concentration is studied in detail. We also show how exciton dynamics can be inferred from experimental data by deriving an analytical expression relating the energy and intensity of lines to the model parameters.

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