Publication date: 15th December 2025
Halide perovskite quantum dot nanocrystals have shown great potential as quantum emitters of single photons or entangled photon pairs due to their exceptional brightness, weak blinking or spectral diffusion and optical coherence times close to their radiative lifetimes. Key to their performances are the properties of excitonic states, strongly interacting electron-hole pairs confined inside the quantum dots. In particular, their spin degree of freedom leads to a meV-scale splitting of the excitonic ground state into four states of differing oscillator strength called the fine structure. This talk is meant as an accessible introduction and discussion of the exciton fine structure in perovskite quantum dots from a theoretical viewpoint based on semi-empirical methods. In particular, the physical origin and symmetry of the exciton fine structure, the screening of the exchange interaction and its decomposition into a short range part and a long range part will be discussed.
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