DOI: https://doi.org/10.29363/nanoge.emlem.2023.001
Publication date: 18th August 2023
Collective excitations in Perovskite cesium lead bromide (CsPbBr3) nanocrystals have garnered significant attention due to their ability to facilitate rapid and coherent emission, surpassing standard isolated nanocrystals. In 1954, Dicke formulated the theoretical framework for superradiance and superfluorescence, describing the correlated spontaneous emission of closely-packed quantum emitters.[1] Self-assembled perovskite superlattices have exhibited collective emergent phenomena characterized by fast, narrow, and coherent emission.[2] However, the physical boundaries constraining this phenomenon are not yet fully understood. Recent reports include surprising superfluorescence, even at room temperature. Since all superfluorescence demonstrations have excited the quantum dots using diffraction-limited laser sources, observing such phenomena with nanometer spatial resolution has remained an open challenge, precisely the critical scale at which the collective correlations occur. We overcome this challenge by using a pulsed free electron beam to induce excitons in lead-halide perovskite superlattices with nanometer spatial resolution and picosecond temporal resolution. I will discuss the apparatus that extends the limits of observation of cathodoluminescence from nanocrystal superlattices and present new results[3]. Our results emphasize the challenge of observing superfluorescence, including spectral non-homogeneity of nanocrystals at their edges and nontrivial blue-shifted emission counter to the mainly red-shited reported peak.
This project is supported by the European Union’s Horizon 2020 research and innovation program under grant agreement No 949682- ERC
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