Electronic Localization Properties of a Double Strand of DNA: A Simple Model with Long-Range Correlated Hopping Disorder

TL;DR

This study investigates how long-range correlated disorder affects electron localization in a double-strand DNA model, revealing that such correlations can enhance localization length near the band center.

Contribution

It introduces a simple double-strand DNA model with long-range correlated hopping disorder and analyzes its localization properties numerically.

Findings

Correlation increases localization length near the band center.

Density of states and Lyapunov exponent are affected by correlated disorder.

Long-range correlations influence electron localization in DNA models.

Abstract

Localization property in the disordered few-chain DNA systems with a long-range correlation is numerically investigated. We apply the chain system with the correlated disorder in the interchain and/or intrachain hoppings to the simple model of a double strand of DNA. Numerical results for the density of states and the Lyapunov exponent of the wave function in the two- or three-chain models are given. It is found that the correlation effect enhances the localization length (the inverse least nonnegative Lyapunov exponent) around the band center.