Figure 3.

Scheme describing the mechanism of the CISS effect in terms of a small spin polarization, ΔP, that arises from the SOC. This small spin polarization causes a spin blockade, because of the Pauli principle, that is proportional to the singlet–triplet energy gap, E_ST, in the molecule. The purple and green curves represent the charge distribution occurring upon applying the field across the molecule, for electrons with spin aligned parallel (green) or antiparallel (purple) to their velocities. The molecule is presented schematically as a coil. The yellow lines indicate the Fermi energy at each electrode, and the dotted line shows the electric field across the molecule, assuming a molecule with a very low dielectric constant.