RT Journal Article
T1 Excitation optical-absorption in self-similar aperiodic lattices
A1 Maciá Barber, Enrique Alfonso
A1 Domínguez-Adame Acosta, Francisco
AB 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.
PB American Physical Society
SN 0163-1829
YR 1994
FD 1994-12-15
LK https://hdl.handle.net/20.500.14352/59382
UL https://hdl.handle.net/20.500.14352/59382
LA eng
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NO © 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.
NO Universidad Complutense
DS Docta Complutense
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