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Carrier Transport Engineering in Carbon Nanotubes by Chirality Induced Spin Polarization.

Carbon nanotubes (CNTs), helically wrapped with single-stranded DNA, have recently emerged as a spin filtering material. The inversion asymmetric helical potential of DNA creates a spin filtering effect (commonly known as "chirality induced spin selectivity" or CISS), which polarizes carrier spins in the nanotube. Thus, tuning of DNA-CNT interaction is expected to affect carrier spins in nanotubes. The CISS effect induces spin polarization, which is coupled with the carrier's momentum direction, and therefore, in one-dimensional systems such as nanotubes, momentum flip must be accompanied by a simultaneous spin flip. This spin-momentum locking can have a profound impact on charge transport in nanotubes since backscattering due to phonons and disorder will be suppressed as these mechanisms are spin-independent. Here we report DNA-CNT spin filters in which CNTs have been functionalized with two different classes of sequences, exhibiting different degrees of interaction with CNT. They induce different degrees of spin polarization in the channel, with significant impact on temperature-dependent charge transport and interference phenomena arising from carrier backscattering. This work raises the intriguing possibility of engineering charge transport in nanotubes via CISS-induced spin polarization by tailor-made DNA sequences.