Fig. 2. Photoinduced quantum beatings in MAPbI₃ single crystal at various magnetic field strengths measured at 4 K with light incident along [100] and applied magnetic field along [001].

a–c Magnetic-field dependence of the c-PPR(t) response measured at 758.5 nm pump/probe beams at various field strengths as denoted, and their corresponding FFT spectra d–f. g The corresponding QB frequencies for the fast (red) and slow (blue) beatings vs. B up to 700 mT and the obtained g-values from the various slopes, as indicated.