Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/3570
Título: Influence of the sign of the coupling on the temperature dependence of optical properties of one-dimensional exciton models
Autor: Cruzeiro, Leonor
Data: 10-Set-2008
Editora: IOP Science
Citação: Cruzeiro, L. Influence of the sign of the coupling on the temperature dependence of optical properties of one-dimensional exciton models, Journal of Physics B: Atomic, Molecular and Optical Physics, 41, 19, 195401-195401, 2008.
Resumo: A new physical cause for a temperature-dependent double peak in exciton systems is put forward within a thermal equilibrium approach for the calculation of optical properties of exciton systems. Indeed, it is found that one-dimensional exciton systems with only one molecule per unit cell can have an absorption spectrum characterized by a double peak provided that the coupling between excitations in different molecules is positive. The two peaks, whose relative intensities vary with temperature, are located around the exciton band edges, being separated by an energy of approximately 4V, where V is the average coupling between nearest neighbours. For small amounts of diagonal and off-diagonal disorder, the contributions from the intermediate states in the band are also visible as intermediate structure between the two peaks, this being enhanced for systems with periodic boundary conditions. At a qualitative level, these results correlate well with experimental observations in the molecular aggregates of the thiacarbocyanine dye THIATS and in the organic crystals of acetanilide and N-methylacetamide.
Peer review: yes
URI: http://hdl.handle.net/10400.1/3570
DOI: http://dx.doi.org/10.1088/0953-4075/41/19/195401
ISSN: 0953-4075
Versão do Editor: http://iopscience.iop.org/0953-4075/41/19/195401
Aparece nas colecções:FCT2-Artigos (em revistas ou actas indexadas)

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