Anomalous optical absorption in a random system with scale-free disorder
Disordered Systems and Neural Networks
2009-11-11 v1
Abstract
We report on an anomalous behavior of the absorption spectrum in a one-dimensional lattice with long-range-correlated diagonal disorder with a power-like spectrum in the form S(k) ~ 1/k^A. These type of correlations give rise to a phase of extended states at the band center, provided A is larger than a critical value A_c. We show that for A < A_c the absorption spectrum is single-peaked, while an additional peak arises when A > A_c, signalling the occurrence of the Anderson transition. The peak is located slightly below the low-energy mobility edge, providing a unique spectroscopic tool to monitor the latter. We present qualitative arguments explaining this anomaly.
Cite
@article{arxiv.cond-mat/0501311,
title = {Anomalous optical absorption in a random system with scale-free disorder},
author = {E. Diaz and A. Rodriguez and F. Dominguez-Adame and V. A. Malyshev},
journal= {arXiv preprint arXiv:cond-mat/0501311},
year = {2009}
}
Comments
4 pages, 4 postscript figures, uses revtex4