Chiral superfluorescence from perovskite superlattices at room temperature

Superfluorescence (SF) is the collective emission of intense, coherent light from an interacting ensemble of quantum emitters1–4. Although SF has been observed in several solid-state materials5–8, the spontaneous generation of circularly polarized SF from chiral materials (chiral SF) has not been realized9,10. 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. Chiral perovskite superlattices exhibit room-temperature circularly polarized superfluorescence, with emission intensity and polarization controllable by weak magnetic fields.