Optical absorption in Fibonacci lattices at finite temperature
Abstract
We consider the dynamics of Frenkel excitons on quasiperiodic lattices, focusing our attention on the Fibonacci case as a typical example. We evaluate the absorption spectrum by solving numerically the equation of motion of the Frenkel-exciton problem on the lattice. Besides the main absorption line, satellite lines appear in the high-energy side of the spectra, which we have related to the underlying quasiperiodic order. The influence of lattice vibrations on the absorption line-shape is also considered. We find that the characteristic features of the absorption spectra should be observable even at room temperature. Consequently, we propose that excitons act as a probe of the topology of the lattice even when thermal vibrations reduce their quantum coherence.
Keywords
Cite
@article{arxiv.cond-mat/9707256,
title = {Optical absorption in Fibonacci lattices at finite temperature},
author = {A. Rodriguez and F. Dominguez-Adame},
journal= {arXiv preprint arXiv:cond-mat/9707256},
year = {2009}
}
Comments
Revtex 3.0, epsfig, 2 postscript figures included