Helicoidal Fields and Spin Polarized Currents in CNT-DNA Hybrids

Details Helicoidal Fields and Spin Polarized Currents in CNT-DNA Hybrids Helicoidal Fields and Spin Polarized Currents in CNT-DNA Hybrids

2011-12-17

arxiv.org/abs/1112.4000v1

Phys. Rev. Lett. 108, 126601 (2012)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.108.126601

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.

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