Fig. 3: Photon and charge carrier emission dynamics and intrinsic spin contrast.

a, b The experimental (thin) and theoretical (bold) time traces of the normalized PL intensity upon turning on the laser excitation pulse of 1 and 3 mW power, respectively, for various initial electron and nuclear spin states. For a better visibility, the curves corresponding to |0,0〉, |−1,1〉 and |−1,0〉 initial states are shifted down by 0.05, 0.1 and 0.15, respectively. To prepare different initial spin states in the experiment, RF, MW0 and MW1 π-pulses were used (see Fig. 4a). The theoretical results closely follow the experimental curves. d, e The time traces of the simulated electron currents (solid lines) and hole currents (dashed lines) for 1 and 3 mW laser power, respectively, for |0,1〉 and |−1,1〉 initial spin states. The curves are normalized to the steady-state electron current obtained for the |0,1〉 initial spin state. The areas below the electron and hole currents (grey areas under the solid and dashed lines) are integrated to the same value to ensure the charge neutrality constraint of the photoionization cycle. The difference between the solid (dashed) curves provides the spin contrast of the electron (hole) current. c, f The theoretical ODMR contrast and the contrast of the electron-only current, the hole-only current, and the total current (PDMR) as a function of integration time for 1 and 3 mW excitation power, respectively. In the case of ODMR and PDMR, the contribution of the experimental background signal is taken into consideration as well.