Weizmann preprint frames CISS polarization as transport leakage from dominant geometrical spin currents in dsDNA

Vager revisits his earlier geometrical spin-current formalism for electrons on curved trajectories and scales it to dsDNA parameters, finding intrinsic magnitudes substantially exceed the nanoampere-scale transport currents typical in CISS experiments. This hierarchy implies that chiral molecules host pre-polarized spin-current branches from which ordinary charge transport selectively samples one spin species. The result reframes the long-standing quantitative discrepancy between observed polarizations (often >50%) and microscopic spin-orbit strengths in organics.

Prior CISS literature, including Naaman-Waldeck experiments and Göhler et al. photoemission studies, documented large polarizations without a mechanism matching the scale. Vager's leakage picture supplies a selection rather than generation account, consistent with the absence of strong spin filtering in linear conductance yet pronounced effects under chiral constraints. It also aligns with emerging reports of CISS-like behavior in non-chiral but curved nanostructures.

The central limitation is the absence of direct experimental access to the predicted geometrical current scale; all cited values remain estimates. A decisive test would require local probes capable of mapping spin accumulation along individual helices without net transport. Until such measurements exist, the hierarchy argument functions as a consistency condition rather than a verified mechanism.

Follow-up work should target suspended dsDNA devices with integrated spin-sensitive contacts to quantify leakage fractions directly.