Figure 5: Kinetics of spin-separation effect.
From: Dynamic spin polarization by orientation-dependent separation in a ferromagnet–semiconductor hybrid
(a–c) Time-resolved data for '10 nm' sample. (a) Photoluminescence (PL) intensity transient (dots) fitted with an exponential decay convoluted with the apparatus function (line). Γ−1=0.4 ns. (b) Appearance of circular polarization ρc (full symbols) under linearly polarized excitation and modulation parameter η (empty symbols) for B=+125 (triangles) and −125 mT (circles). (c) 
decay under circular polarized excitation for B=0 (black) and B=125 mT (red). In this case, the average of 
measured for opposite field directions corresponds to the optical orientation signal. This allows us to exclude odd-B effects related to SDC. Lines in (b) and (c) are linear fits to the data. (d) Dependence of the dynamical parameters on spacer thickness: PL decay rate Γ (squares), difference between the SDC rates γ+–γ– (diamonds), and electron-spin relaxation rate 1/τS (circles). Temperature T=2 K.
