Chiral superfluorescence from perovskite superlattices at room temperature

Superfluorescence (SF) is the collective emission of intense, coherent light from an interacting ensemble of quantum emitters^1-4. Although SF has been observed in several solid-state materials^5-8, the spontaneous generation of circularly polarized SF from chiral materials (chiral SF) has not been realized^9,10. Here, we report the observation of chiral SF originating from edge states in large-area (>100 µm × 100 µm), vertically aligned chiral perovskite superlattices at room temperature. Theoretical quantum optics calculations describe the transition from initially unpolarized, incoherent spontaneous emission to a coherent chiral SF state, quantitatively reproducing both the experimentally observed generation of circular polarization (up to about 14%) and its reversal of sign with opposite material handedness. Moreover, we show that both the intensity and the degree of circular polarization of chiral SF can be modulated by a weak magnetic field, enabling precise control over solid-state quantum light emission at room temperature. Our findings demonstrate an interplay between chirality and many-body quantum coherence, thereby showing promising new directions for chirality-controlled quantum optical applications.