We are investigating the electronic properties of DNA by looking at a tight‐binding model and four DNA sequences. The charge transfer is studied in terms of localisation lengths as a function of Fermi energy and backbone disorder, the latter accounting for different environments. We have performed calculations on poly(dG)‐poly(dC), telomeric DNA, random‐ATGC DNA, λ‐DNA and find that random‐ATGC and λ‐DNA have localization lengths allowing for electron motion among a few dozen base pairs only, whereas for telomeric and poly(dG)‐poly(dC) DNA they are much larger. Enhancement of localisation lengths is observed at particular energies for an increasing binary backbone disorder.

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