Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.186
Publication date: 18th December 2023
The brightness of an emitter is ultimately described by Fermi’s golden rule, with the decay rate of the emitter’s excited state proportional to the product of its oscillator strength and the local density of photonic states (LDOS). Since the former is an intrinsic material property and, hence, already set by the choice of the employed compound, the quest for ever brighter emission has mainly focused on enhancing the LDOS using dielectric or plasmonic resonators to achieve a large Purcell effect or strong light-matter interactions1,2. A much less explored avenue is to boost the oscillator strength, and hence the emission rate, via a collective behavior termed superradiance. Recently, it had been proposed that the latter can be realized via the giant oscillator-strength transitions of a weakly confined exciton in a quantum dot (QD) when its coherent motion extends over many unit cells. Here we demonstrate single-photon superradiance in perovskite quantum dots (QDs) with a record-low sub-100 ps radiative decay time, almost as short as the reported exciton coherence time3. The characteristic dependence of radiative rates on QD size, composition, and temperature suggest the formation of giant dipoles, as confirmed by effective-mass calculations. The results aid the development of ultrabright, coherent quantum-light sources and attest that quantum effects, e.g. single-photon emission, persist in nanoparticles ten times larger than the exciton Bohr radius.
1) Purcell, E. M., Torrey, H. C. & Pound, R. V. Resonance absorption by nuclear magnetic moments in a solid. Phys. Rev. 69, 37 (1946).
2) Tomm, N. et al. A bright and fast source of coherent single photons. Nat. Nanotechnol. 16, 399-403 (2021).
3) Utzat, H. et al. Coherent single-photon emission from colloidal lead halide perovskite quantum dots. Science 363, 1068-1072 (2019).
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