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High-temperature superfluorescence in methyl ammonium lead iodide
Nature Photonics  (IF38.771),  Pub Date : 2021-06-21, DOI: 10.1038/s41566-021-00830-x
Gamze Findik, Melike Biliroglu, Dovletgeldi Seyitliyev, Juliana Mendes, Andrew Barrette, Hossein Ardekani, Lei Lei, Qi Dong, Franky So, Kenan Gundogdu

Light–matter interactions can create and manipulate collective many-body phases in solids1,2,3, which are promising for the realization of emerging quantum applications. However, in most cases, these collective quantum states are fragile, with a short decoherence and dephasing time, limiting their existence to precision tailored structures under delicate conditions such as cryogenic temperatures and/or high magnetic fields. In this work, we discovered that the archetypal hybrid perovskite, MAPbI3 thin film, exhibits such a collective coherent quantum many-body phase, namely superfluorescence, at 78 K and above. Pulsed laser excitation first creates a population of high-energy electron–hole pairs, which quickly relax to lower energy domains and then develop a macroscopic quantum coherence through spontaneous synchronization. The excitation fluence dependence of the spectroscopic features and the population kinetics in such films unambiguously confirm all the well-known characteristics of superfluorescence. These results show that the creation and manipulation of collective coherent states in hybrid perovskites can be used as the basic building blocks for quantum applications4,5.