Publication date: 15th December 2025
Lead halide perovskites open great prospects for optoelectronics and a wealth of potential applications in quantum optical and spin-based technologies. Precise knowledge of the fundamental optical and spin properties of charge-carrier complexes at the origin of their luminescence is crucial in view of the development of these applications. We perform low temperature magneto-optical spectroscopy on single perovskite nanocrystals, to reveal their entire band-edge exciton fine structure and study the bright-dark exciton level ordering depending on materials composition. Combining spectroscopic measurements on various perovskite nanocrystal compounds, we show evidence for universal scaling laws relating the exciton fine structure splitting, the trion and biexciton binding energies to the band-edge exciton energy in lead-halide perovskite nanostructures.
We also show that tailored perovskite nanostructures can be used as robust coherent single photon sources which display two-photon quantum interference visibilities of up to 60% in the absence of any radiative enhancement or photonic architecture. These findings highlight the remarkable potential of perovskite nanocrystals as scalable, colloidal sources of indistinguishable single photons for quantum technologies.
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