Publication date: 8th July 2026
Lead halide perovskites offer great potential for optoelectronics and quantum technologies. Understanding their fundamental optical and spin properties is key to advancing these applications.
Using low-temperature magneto-optical spectroscopy on single perovskite nanocrystals, we fully resolve their band-edge exciton fine structure and reveal how exciton level ordering depends on composition. Across various compounds, we establish universal scaling laws linking exciton fine structure splitting, trion and biexciton binding energies to band-edge exciton energy.
Remarkably, methylammonium lead halide perovskite nanocrystals (MAPbX₃, X = Br, I) nanocrystals deviate from these universal trends. Their low-temperature magneto-optical spectra display distinct excitonic signatures that point to inversion-symmetry breaking and the emergence of a Rashba effect. We propose that the low-temperature ordering of the permanent methylammonium dipoles generates an internal electric polarization, providing the microscopic origin of this behavior and fundamentally modifying the excitonic fine structure.
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