ABSORPTION SPECTRA AND LEVEL SPACING STATISTICS IN A TERNARY ALLOY WITH AN ORNSTEIN–UHLENBECK DISORDER DISTRIBUTION

M. O. Sales, T. F. Assunção, S. S. Albuquerque and F. A. B. F. de Moura ()
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M. O. Sales: Instituto de Física, Universidade Federal de Alagoas, Maceió AL 57072-970, Brazil
T. F. Assunção: Instituto de Física, Universidade Federal de Alagoas, Maceió AL 57072-970, Brazil
S. S. Albuquerque: Curso de Física, Universidade Federal de Alagoas Campus Arapiraca – Av., Manoel Severino Barbosa, s/n, Bom Sucesso – Arapiraca – AL, CEP 57309-005, Brazil
F. A. B. F. de Moura: Instituto de Física, Universidade Federal de Alagoas, Maceió AL 57072-970, Brazil

International Journal of Modern Physics C (IJMPC), 2014, vol. 25, issue 02, 1-12

Abstract: In this paper, we study the dynamics of a one-electron in a one-dimensional (1d) alloy with a correlated Ornstein–Uhlenbeck (OU) disorder distribution. The model considered here corresponds to an alloy with three types of atoms where the position of each atom is obtained using a stochastic rule based on the OU process. We analyze in detail the effect of this correlated disorder in the optical absorption spectrum and the level spacing statistics near the band center. Our results reveal a new collection of optical absorption peaks. We explain in details the appearance of each peak. Our calculations about the level spacing's distribution reveals a Poisson distribution thus contradicting previous statements about the existence of extended states in ternary electronic models with correlated disorder distribution.

Keywords: One-electron; correlated disorder; wave-packet; 05.40.-a; 05.60.Cd; 05.10.Gg (search for similar items in EconPapers)
Date: 2014
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DOI: 10.1142/S0129183113500915

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