Thermal Decoherence of Superradiance in Lead Halide Perovskite Nanocrystal Superlattices

Fausto Borgonovi, Francesco Mattiotti, Masaru Kuno, Boldizsár Jankó, G. Luca Celardo

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Recent experiments by Rainò et al. (Nature 2018, 563, 671-675) have documented cooperative emission from CsPbBr3 nanocrystal superlattices, exhibiting the hallmarks of low-temperature superradiance. In particular, the optical response is coherent and the radiative decay rate is increased by a factor of 3, relative to that of individual nanocrystals. However, the increase is 6 orders of magnitude smaller than what is theoretically expected from the superradiance of large assemblies, consisting of 106-108 interacting nanocrystals. Here, we develop a theoretical model of superradiance for such systems and show that thermal decoherence is largely responsible for the drastic reduction of the radiative decay rate in nanocrystal superlattices. Our theoretical approach explains the experimental results (Nature 2018, 563, 671-675), provides insight into the design of small nanocrystal superlattices, and shows a 4 orders of magnitude enhancement in superradiant response. These quantitative predictions pave the path toward observing superradiance at higher temperatures.
Original languageEnglish
Pages (from-to)7382-7388
Number of pages7
JournalNano Letters
Volume20
DOIs
Publication statusPublished - 2020

Keywords

  • Cooperative effects
  • CsPbBr
  • 3
  • nanocrystals
  • superradiance
  • quantum dots
  • quantum materials
  • superfluorescence
  • superlattice
  • perovskite

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