2026-06-29T07:24:40Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/593822023-08-25T21:25:40Zcom_20.500.14352_14col_20.500.14352_15
Excitation optical-absorption in self-similar aperiodic lattices
Maciá Barber, Enrique Alfonso
Domínguez-Adame Acosta, Francisco
538.9
Gaas-Alas Heterostructures
Thue-Morse Chain
Electronic-Properties
Phonon Properties
Energy-Spectrum
Wave-Function
Fibonacci
Systems
Física de materiales
© 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.
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.
Universidad Complutense
Depto. de Física de Materiales
Fac. de Ciencias Físicas
TRUE
pub
2023-06-20T19:12:01Z
2023-06-20T19:12:01Z
1994-12-15
journal article
https://hdl.handle.net/20.500.14352/59382
0163-1829
10.1103/PhysRevB.50.16856
eng
No. PR161/93-4811
open access
application/pdf
American Physical Society