Anomalous localization and dual role of correlation in one-dimensional electronic systems with long-range correlated disorder

The localization behaviors of electronic states and the role of long-range correlation (LRC) in a one-dimensional tight-binding Anderson model with long-range correlated diagonal disorder were numerically studied at the band center by using the transfer matrix method. Two different kinds of localized states with anomalous properties were found in two special localized regimes: regime I with both weak correlation and weak disorder and regime II with both strong correlation and strong disorder. Further calculations show that the LRC plays inverse role in these two regimes: by increasing the degree of LRC, the localization is suppressed in regime I while the localization is enhanced in regime II.