Figure 1
Schematic diagram (a) of nonequilibrium electrons which occupy two spin-splitting energy bands and experimental setup diagram (b). (a) An in-plane magnetic field perpendicular to k x is applied to induce the Zeeman split energy Δ E=g∗μ B B. The blue dots stand for photo-excited nonequilibrium electrons. Curving arrows show the electron relaxation process. The thicker arrows mean the higher relaxation rate. (b) The magnetic field is rotated in the x-y plane.