Room temperature superfluorescence from a single nanocuboid*

Single-photon superradiance arises when a collection of identical emitters are spatially separated by distances much less than the wavelength of the light they emit and results in the formation of a superradiant state that spontaneously emits light with a rate that scales linearly with the number of emitters. This collective phenomena has only been demonstrated in a few nanomaterial systems, none of which have used quasi-2D nanoplatelets as the emitter. By combining molecular dynamics, atomistic electronic structure calculations, and model Hamiltonians methods, we show that quasi-2D nanoplatelets oriented along each face of a “nanocuboid” can serve as the (nearly) identical emitters required to observe both superradiant and subradiant phenomena. And we demonstrate single-photon superfluorescence via single-particle time-resolved photoluminescence measurements at room temperature. These findings open the door to ultrafast single-photon emitters and may provide an avenue to entangled multi-photon states via superradiant cascades.