Fig. 4: Theoretical calculation of optical dipole transition strength for a three-level system.
From: Laser-induced coherent spin change due to spin-orbit coupling
a Energy dispersion of sp3 tight-binding model for a magnetic material. The color represents the normalized \(\left\langle S\right\rangle\); blue (red) for spin majority (minority) states. Green down arrows represent anti-crossing points. b (top panel) Dispersion of a three-level system, which is taken from a and contains a single anti-crossing point (green down arrow). \({{\rm{V}}}_{\uparrow }\) is the occupied valence band with spin up. \({{\rm{C}}}_{{\rm{L}},\uparrow (\downarrow )}\) is the unoccupied conduction band with intermediate energy with spin up (down). \({{\rm{C}}}_{{\rm{H}},\uparrow (\downarrow )}\) is the unoccupied conduction band with highest energy and spin up (down). (bottom panel) V-CL (V-CH) is the normalized strength of optical dipole transition between V and CL (CH).
