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High spin polarization materials or spin filters are key components inspintronics, a niche subfield of electronics where carrier spins play afunctional role. Carrier transmission through these materials is "spinselective" i.e. these materials are able to discriminate between "up" and"down" spins. Common spin filters include transition metal ferromagnets andtheir alloys, with typical spin selectivity (or, polarization) ~50% or less.Here we consider carrier transport in an archetypical one-dimensional molecularhybrid in which a single wall carbon nanotube (SWCNT) is wrapped around bysingle stranded deoxyribonucleic acid (ssDNA). By magnetoresistancemeasurements we show that this system can act as a spin filter with maximumspin polarization approaching ~74% at low temperatures, significantly largerthan transition metals under comparable conditions. Inversion asymmetrichelicoidal potential of the charged ssDNA backbone induces a Rashba spin-orbitinteraction in the SWCNT channel and polarizes carrier spins. Our results areconsistent with recent theoretical work that predicted spin dependentconductance in ssDNA-SWCNT hybrid. Ability to generate highly spin polarizedcarriers using molecular functionalization can lead to magnet-less andcontact-less spintronic devices in the future. This can eliminate theconductivity mismatch problem and open new directions for research in organicspintronics.

Spin Filtering through Single-Wall Carbon Nanotubes Functionalized with Single-Stranded DNA