The effect of nanocrystal shape and superlattice morphology on superfluorescence in semiconductor nanocrystal superlattices

Cooperative emission of radiation from multiple emitters (superfluorescence or SF) has been predicted and even observed in molecular aggregates. In superlattices of semiconductor nanocrystals, theory predicts that SF enhancement of up to N (the number of nanocrystals) can be observed. However, only weak (~6 orders of magnitude less than N) superfluorescence has been observed in such systems. It has been proposed that this is because the SF is sensitive to thermal decoherence (finite temperature) and variations in the sizes of nanocrystals. In this talk, we show how modifying the shape of the nanocrystals and the morphology of the superlattice makes SF more robust to temperature and nanocrystal size variations. We will show that superfluorescence from cuboid-shaped nanocrystals and 2D superlattices is more robust than cubic nanocrystals and 3D superlattices.