  Conformational effect on electronic localization is critically investigated
for the first time considering a double-stranded helical geometry (DSHG)
subjected to an electric field. In the presence of electric field the DSHG
behaves like a correlated disordered system whose site potentials are modulated
in a cosine form like the well known Aubry-Andre-Harper (AAH) model. The
potential distribution can be modulated further by changing the orientation of
the incident field. A similar kind of cosine modulation is also introduced in
the inter-strand hopping integrals of the DSHG. Suitably adjusting the
orientation of the electric field, we can achieve fully extended energy
eigenstates or completely localized ones or a mixture of both. The effects of
short-range and long-range hopping integrals along with the chirality on
localization are thoroughly studied. Finally, we inspect the role of helical
dynamics to make the model more realistic. The interplay between the helical
geometry and electric field may open up several notable features of electronic
localization and can be verified by using different chiral molecules.
