Helicoidal Fields and Spin Polarized Currents in CNT-DNA Hybrids

TL;DR

This paper presents theoretical analysis showing that DNA-wrapped carbon nanotubes can generate spin-polarized currents without magnetic fields, influenced by the DNA's helicoidal electric field, with implications for spintronic device development.

Contribution

The study introduces a theoretical framework demonstrating spin polarization in CNT-DNA hybrids driven by helicoidal electric fields, without magnetic fields, highlighting potential spintronic applications.

Findings

Spin polarization occurs without magnetic fields.

The polarization depends on wrapping direction and length.

Potential for CNT-based spintronic devices.

Abstract

We report on theoretical studies of electronic transport in the archetypical molecular hybrid formed by DNA wrapped around single-walled carbon nanotubes (CNTs). Using a Green's function formalism in a $\pi$-orbital tight-binding representation, we investigate the role that spin-orbit interactions play on the CNT in the case of the helicoidal electric field induced by the polar nature of the adsorbed DNA molecule. We find that spin polarization of the current can take place in the absence of magnetic fields, depending strongly on the direction of the wrapping and length of the helicoidal field. These findings open new routes for using CNTs in spintronic devices.