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Optical absorption in paired correlated random lattices

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Domínguez-Adame Acosta, Francisco and Maciá Barber, Enrique Alfonso and Sánchez, Angel (1994) Optical absorption in paired correlated random lattices. Physical Review B, 50 (9). pp. 6453-6456. ISSN 0163-1829

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Official URL: http://dx.doi.org/10.1103/PhysRevB.50.6453


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Abstract

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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© 1994 The American Physical Society.
The authors thank Biaachi Mendez for a critical reading of the manuscript. This work is partially supported by UCM under project No. PR161/93-4811. A.S. is supported by a Ministerio de Educacion y Ciencia (Spain)/Fulbright postdoctoral scholarship, by Direccion General de Investigacion Cientifica y Tecnica (Spain) through Project No. PB92-0248, and by the European Community (Union Human Capital and Mobility Programme through Contract No. ERBCHRXCT930413). Work at Los Alamos is performed under the auspices of the U.S. Department of Energy.

Uncontrolled Keywords:Random-Dimer model, Frenkel excitons, Systems
Subjects:Sciences > Physics > Materials
ID Code:28072
Deposited On:29 Jan 2015 09:38
Last Modified:18 Mar 2015 08:39

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