title: (De)localization and the mobility edges in a disordered double chain with long-range intrachain correlation and short-range interchain correlation.
abstract: Correlation effects and phase transitions are central issues in current studies on disordered systems. In this paper, we study the electronic properties of a disordered double chain with long-range intrachain correlation and short-range interchain correlation. Based on detailed numerical calculations, finite size scaling analysis and empirical analytical calculations, we obtain a phase diagram containing rich physics due to the interplay among the disorder, short-range and long-range correlations. Besides the long-range correlation induced localization-delocalization transitions, we find both first-order and second-order quantum phase transitions on changing the short-range correlation. Interestingly, the localization may be suppressed by increasing the disorder strength in some parameter regime and the 'anti-correlation' leads to the most delocalized state. Our studies shine some light on the mechanism of the charge transport in DNA molecules, where both types of correlated disorders are present.
authors.affiliation: Institute of Applied Physics and Computational Mathematics, Beijing, People's Republic of China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhao
authors.forename: Suqing
authors.initials: S
authors.lastname: Duan
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang