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

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 $S(k)\propto k^{-α}$, 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 $α>2$, and the mobility edges are at $\pm E_{c}=\pm|2-W/2|$. Furthermore, we find the critical exponent $ν$ of localization length ($ξ\sim |E-E_{c}|^{-ν}$) to be $ν=1+1.4e^{2-α}$. Thus our results indicate that the disorder strength $W$ determines the mobility edges and the degree of correlation $α$ determines the critical exponents.

No reviews yet.

No comments yet.