Enhanced spin-polarized transport through DNA double helix by gate voltage

TL;DR

This paper demonstrates that applying a gate voltage can significantly enhance and control spin-polarized transport through DNA, with potential implications for molecular spintronics.

Contribution

It introduces a method to manipulate DNA spin transport using gate voltage, revealing strong dependence and oscillations in spin polarization based on voltage and DNA length.

Findings

Spin polarization depends strongly on gate voltage magnitude and direction.

Gate voltage tuning can significantly enhance spin polarization.

Spin polarization exhibits oscillating behavior with DNA length.

Abstract

We report on a way to manipulate the spin transport through double-stranded DNA contacted by normal-metal electrodes. On the basis of an effective model Hamiltonian, the conductance and the spin polarization are calculated in the presence of a gate voltage by using the Landauer-B\"uttiker formula. Our results indicate that the spin polarization presents strong dependence on the magnitude as well as the direction of the gate voltage. The spin polarization can be significantly enhanced by tuning the gate voltage and shows oscillating behavior with increasing the DNA length.