Maciá Barber, Enrique AlfonsoDomínguez-Adame Acosta, Francisco2023-06-202023-06-201994-12-150163-182910.1103/PhysRevB.50.16856https://hdl.handle.net/20.500.14352/59382© 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.engjournal articlehttp://dx.doi.org/10.1103/PhysRevB.50.16856http://journals.aps.orgopen access538.9Gaas-Alas HeterostructuresThue-Morse ChainElectronic-PropertiesPhonon PropertiesEnergy-SpectrumWave-FunctionFibonacciSystemsFísica de materiales