Single-photon superradiance in individual caesium lead halide quantum dots

Chenglian Zhu, Simon C. Boehme, Leon G. Feld, Anastasiia Moskalenko, Dmitry N. Dirin, Rainer F. Mahrt, Thilo Stöferle, Maryna I. Bodnarchuk, Alexander L. Efros, Peter C. Sercel (), Maksym V. Kovalenko () and Gabriele Rainò ()
Additional contact information
Chenglian Zhu: ETH Zürich
Simon C. Boehme: ETH Zürich
Leon G. Feld: ETH Zürich
Anastasiia Moskalenko: ETH Zürich
Dmitry N. Dirin: ETH Zürich
Rainer F. Mahrt: IBM Research Europe—Zurich
Thilo Stöferle: IBM Research Europe—Zurich
Maryna I. Bodnarchuk: ETH Zürich
Alexander L. Efros: US Naval Research Laboratory
Peter C. Sercel: Center for Hybrid Organic Inorganic Semiconductors for Energy
Maksym V. Kovalenko: ETH Zürich
Gabriele Rainò: ETH Zürich

Nature, 2024, vol. 626, issue 7999, 535-541

Abstract: Abstract The brightness of an emitter is ultimately described by Fermi’s golden rule, with a radiative rate proportional to its oscillator strength times the local density of photonic states. As the oscillator strength is an intrinsic material property, the quest for ever brighter emission has relied on the local density of photonic states engineering, using dielectric or plasmonic resonators1,2. By contrast, a much less explored avenue is to boost the oscillator strength, and hence the emission rate, using a collective behaviour termed superradiance. Recently, it was proposed3 that the latter can be realized using the giant oscillator-strength transitions of a weakly confined exciton in a quantum well when its coherent motion extends over many unit cells. Here we demonstrate single-photon superradiance in perovskite quantum dots with a sub-100 picosecond radiative decay time, almost as short as the reported exciton coherence time4. The characteristic dependence of radiative rates on the size, composition and temperature of the quantum dot suggests the formation of giant transition dipoles, as confirmed by effective-mass calculations. The results aid in the development of ultrabright, coherent quantum light sources and attest that quantum effects, for example, single-photon emission, persist in nanoparticles ten times larger than the exciton Bohr radius.

Date: 2024
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DOI: 10.1038/s41586-023-07001-8

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