Localization Properties of Electronic States in Polaron Model of poly(dG)-poly(dC) and poly(dA)-poly(dT) DNA polymers

Abstract

We numerically investigate localization properties of electronic states in a static model of poly(dG)-poly(dC) and poly(dA)-poly(dT) DNA polymers with realistic parameters obtained by quantum-chemical calculation. The randomness in the on-site energies caused by the electron-phonon coupling are completely correlated to the off-diagonal parts. In the single electron model, the effect of the hydrogen-bond stretchings, the twist angles between the base pairs and the finite system size effects on the energy dependence of the localization length and on the Lyapunov exponent are given. The localization length is reduced by the influence of the fluctuations in the hydrogen bond stretchings. It is also shown that the helical twist angle affects the localization length in the poly(dG)-poly(dC) DNA polymer more strongly than in the poly(dA)-poly(dT) one. Furthermore, we show resonance structures in the energy dependence of the localization length when the system size is relatively small.

6 pages, 6 figures

References in corpus (4)

• Charge transport in poly(dG)-poly(dC) and poly(dA)-poly(dT) DNA polymers
• Extended states in disordered systems: role of off-diagonal correlations
• Localization of Electronic States in Chain Model Based on Real DNA Sequence
• The generalized localization lengths in one dimensional systems with correlated disorder

Cited by in corpus (7)

• Electronic Transport in DNA
• DNA double helices for single molecule electronics
• A new type of localized fast moving electronic excitations in molecular chains
• Tight-binding modeling of charge migration in DNA devices
• Quantum Diffusion in Polaron Model of poly(dG)-poly(dC) and poly(dA)-poly(dT) DNA polymers
• Electronic transport and localization in short and long DNA
• DNA-based tunable THz oscillator