Molecular electronics of DNA double helices using second-order tight-binding modeling

Abstract

This research deals with molecular electronics of DNA double helices. We consider a 10 base-pair poly(G)-poly(C) double stranded DNA molecule, tilted with respect to the intercontact electric field direction. An advanced tight-binding (TB) model including hopping integrals of the next nearest neighbors (NNN) and DNA helix conformation is implemented. The transport properties, such as single electron transmission spectra and current-voltage characteristics as functions of source-drain voltage and tilt angle, are studied both with and without NNN effects.