Abstract
A combined analytical approach is proposed to investigate the spin-selectivity properties of DNA nanowires considering the spin degree of freedom in the extended Peyrard–Bishop–Holstein model. On the basis of a real chain of DNA sequence, no completely pure spin current through DNA is shown, instead, one of the spin currents is dominant over another and creates a spin filtering effect. In several parameter regions, the net charge current is low, and thus a nearly pure spin current could be reported. We examined the effects of external fields, temperature, and sequence variation on spin-dependent charge transfer in DNA. The results show peaks in the DNA spin polarization in some parameter values. A DNA coder can be created according to these polarization peaks. Transporting information by using the DNA spin polarization is interested in information theory. Meanwhile, other parameter values exist, where nearly pure spin currents appear. The appearance of these islands can be confirmed and predicted using th...
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