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Single-photon superradiance can emerge when a collection of identicalemitters are spatially separated by distances much less than the wavelength ofthe light they emit, and is characterized by the formation of a superradiantstate that spontaneously emits light with a rate that scales linearly with thenumber of emitters. This collective phenomena has only been demonstrated in afew nanomaterial systems, all requiring temperatures below 10K. Here, werationally design a single colloidal nanomaterial that hosts multiple (nearly)identical emitters that are impervious to the fluctuations which typicallyinhibit room temperature superradiance in other systems such as molecularaggregates. Specifically, by combining molecular dynamics, atomistic electronicstructure calculations, and model Hamiltonian methods, we show that the facesof a heterostructure nanocuboid mimic individual quasi-2D nanoplatelets and canserve as the robust emitters required to realize superradiant phenomena at roomtemperature. Leveraging layer-by-layer colloidal growth techniques tosynthesize a nanocuboid, we demonstrate single-photon superfluorescence viasingle-particle time-resolved photoluminescence measurements at roomtemperature. This robust observation of both superradiant and subradiant statesin single nanocuboids opens the door to ultrafast single-photon emitters andprovides an avenue to entangled multi-photon states via superradiant cascades.

Room temperature single-photon superfluorescence from a single epitaxial cuboid nano-heterostructure