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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
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 |
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Additional Information: | © 1994 The American Physical Society. |
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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