Origin of Dopant-Carrier Exchange Coupling and Excitonic Zeeman Splitting in Mn-Doped Lead Halide Perovskite Nanocrystals.

Low-dimensional metal halide perovskites have unique optical and electrical properties that render them attractive for the design of diluted magnetic semiconductors. However, the nature of dopant-exciton exchange interactions that result in spin-polarization of host-lattice charge carriers as a basis for spintronics remains unexplored. Here, we investigate Mn-doped CsPbCl nanocrystals using magnetic circular dichroism spectroscopy and show that Mn dopants induce excitonic Zeeman splitting which is strongly dependent on the nature of the band-edge structure.