Publication date: 22nd July 2026
Room-temperature superradiant lasing requires materials that can preserve excitonic coherence while simultaneously providing strong optical confinement, low non-radiative loss and controllable polarization. Here, we introduce a chiral Landau staircase of facets as a crystallographic route to cooperative light emission in halide-perovskite laser media [1]. The concept exploits step-mediated crystal growth to generate discrete, hierarchical sequences of terraces, vicinal surfaces and facet junctions, in which morphology evolves through successive stable or metastable configurations rather than continuously. When this faceted architecture is coupled to chiral molecular building blocks or asymmetric growth conditions, the resulting terrace edges, kink sites, screw-dislocation spirals and inequivalent facet intersections can acquire a defined handedness. This multiscale chiral morphology is proposed to couple crystallographic symmetry breaking with exciton spin and optical-mode helicity. Facet-specific strain, dielectric contrast and local field enhancement can modify exciton localization, oscillator strength and radiative coupling, while the ordered staircase provides spatially correlated pathways for exciton transport and photon-mediated communication. The combination of reduced-disorder single-crystalline domains with chiral step-edge networks is expected to favour helicity-selective collective emission, enabling circularly polarized superfluorescent bursts and, under resonant feedback, room-temperature superradiant lasing. In this framework, chirality is not treated solely as a molecular characteristic; it emerges from the coupled evolution of composition, growth kinetics, surface topology and photonic confinement.
The chiral Landau staircase therefore provides a materials-design principle for linking non-equilibrium faceting to polarized cooperative emission. It offers a route toward compact, low-threshold, helicity-programmable coherent light sources for chiral sensing, spin-optoelectronics, secure optical communication and integrated quantum-inspired photonics.
[1] Landau, L. D. On the Theory of Phase Transitions. Zh. Eksp. Teor. Fiz. 1937, 7, 19−32.
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