Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2004-07-07
Eur. Phys. J. E 17(2):149-154, June 2005
Physics
Condensed Matter
Disordered Systems and Neural Networks
6 pages, 6 figures
Scientific paper
10.1140/epje/i2004-10135-8
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.
Archilla Juan F. R.
Hennig Dirk
Starikov Eugen B.
Yamada Hiroaki
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