Critical parameters for the one-dimensional systems with long-range correlated disorder

Details Critical parameters for the one-dimensional systems with long-range correlated disorder Critical parameters for the one-dimensional systems with long-range correlated disorder

2009-08-26

arxiv.org/abs/0908.3871v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

6 pages, 6 figures

Scientific paper

We study the metal-insulator transition in a tight-binding one-dimensional (1D) model with long-range correlated disorder. In the case of diagonal disorder with site energy within $[-\frac{W}{2},\frac{W}{2}]$ and having a power-law spectral density $S(k)\propto k^{-\alpha}$, we investigate the competition between the disorder and correlation. Using the transfer-matrix method and finite-size scaling analysis, we find out that there is a finite range of extended eigenstates for $\alpha>2$, and the mobility edges are at $\pm E_{c}=\pm|2-W/2|$. Furthermore, we find the critical exponent $\nu$ of localization length ($\xi \sim |E-E_{c}|^{-\nu}$) to be $\nu=1+1.4e^{2-\alpha}$. Thus our results indicate that the disorder strength $W$ determines the mobility edges and the degree of correlation $\alpha$ determines the critical exponents.

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