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Excitation optical-absorption in self-similar aperiodic lattices

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Maciá Barber, Enrique Alfonso and Domínguez-Adame Acosta, Francisco (1994) Excitation optical-absorption in self-similar aperiodic lattices. Physical Review B, 50 (23). pp. 16856-16860. ISSN 0163-1829

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Official URL: http://dx.doi.org/10.1103/PhysRevB.50.16856


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Abstract

Exciton optical absorption in self-similar aperiodic one-dimensional systems is considered, focusing our attention on Thue-Morse and Fibonacci lattices as canonical examples. The absorption line shape is evaluated by solving the microscopic equations of motion of the Frenkel-exciton problem on the lattice, in which on-site energies take on two values, according to the Thue-Morse or Fibonacci sequences. Results are compared to those obtained in random lattices with the same stoichiometry and size. We find that aperiodic order causes the occurrence of well-de6ned characteristic features in the absorption spectra, which clearly di8'er from the case of random systems, indicating a most peculiar exciton dynamics. The origin of all the absorption lines is assigned by considering the self-similar aperiodic lattices as composed of two-center blocks, within the same spirit of the renormalization group ideas.


Item Type:Article
Additional Information:

© 1994 The American Physical Society.
The authors thank A. Sánchez for a critical reading of the manuscript. This work was partially supported by Universidad Complutense through Project No. PR161/93-4811.

Uncontrolled Keywords:Gaas-Alas Heterostructures, Thue-Morse Chain, Electronic-Properties, Phonon Properties, Energy-Spectrum, Wave-Function, Fibonacci, Systems
Subjects:Sciences > Physics > Materials
ID Code:27793
Deposited On:16 Dec 2014 10:31
Last Modified:16 Dec 2014 10:31

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