Modeling spin selectivity in charge transfer across the DNA/Gold interface

•DNA in spintronics is applied. Nearly pure spin current is observed in the system.•A combined spin-polaronic PBH model is proposed for spin transfer in DNA molecule.•Spin Hall effect in DNA due to spin-orbit coupling is verified.•The temperature dependence of Hall conductivity is appeared.•Regions of parameters were determined that polarization of spin current is maximum.

Experimental results show that the photoelectrons emitted from the gold substrate due to laser radiation, passe through DNA nanowires with spin-polarized nature. This study proposes the use of chiral DNA molecule in spintronics and information processing. To investigate the spin transfer in DNA molecules, we established a theoretical model based on a combined spin-polaronic Peyrard-Bishop-Holstein model. Accordingly, a nearly pure spin current is appeared. The simultaneous effects of the incident radiation and external magnetic field create characteristic islands corresponding to the pure spin currents, which can be predicted and detected using the multifractal dimensions spectrum. We can verify the spin Hall effect on DNA oligomers through spin-orbit coupling. As such, we can proceed to our significant purpose, which is to create a nearly pure spin current for information transfer and determine the regions of parameter values from which the maximal polarization in spin current emerges.