Fig. 4: Theoretical calculation of optical orientation.
From: Optical spin-orbit torque in heavy metal-ferromagnet heterostructures
Optical spin generation rate \(\left( {{\mathrm{d}}s_{\mathrm{z}}/{\mathrm{d}}t} \right)\) (positive value with red and negative value with blue) on the conduction band in a six layers of [111] Pt and b [111] GaAs in the k space with a continuous light of right-circular polarization (+ħ). On the left and right panels of a, we plot energy levels along A and B lines indicated in the center panel and show associated optical transitions where the oscillation strength is proportional to the size of symbols (green symbols for electrons and black symbols for holes).
