Volume 66, Number 4, May 2004
|Page(s)||585 - 591|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 May 2004|
Delocalization and ballistic dynamics in the two-dimensional Anderson model with long-range correlated disorder
Laboratório de Física Teórica e Computacional, Departamento de Física Universidade Federal de Pernambuco - 50670-901 Recife, PE, Brazil
2 Departamento de Física, Universidade Federal de Alagoas Maceió AL 57072-970, Brazil
Accepted: 17 March 2004
We study the nature of one-electron eigenstates in a two-dimensional () Anderson model with long-range correlated disorder. Long-range correlations are introduced by using a discrete Fourier method which generates an appropriated disorder distribution with spectral density . Our numerical data suggest that the exponents governing the collapse of the participation function for low energies () and the long time decay of the autocorrelation function () satisfy the scaling relation . They also imply that the system exhibits a crossover from a diffusive spread for weakly correlated disorder to a ballistic dynamics associated with the emergence of extended states in the strongly correlated disorder regime .
PACS: 78.30.Ly – Disordered solids / 71.30.+h – Metal-insulator transitions and other electronic transitions / 73.20.Jc – Delocalization processes
© EDP Sciences, 2004
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