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Topological photonics provides an important platform for the development ofphotonic devices with robust disorder-immune light transport and controllablehelicity. Mixing photons with excitons (or polaritons) gives rise to nontrivialpolaritonic bands with chiral modes, allowing the manipulation of helicallasers in strongly coupled light-matter systems. In this work, we demonstratehelical polariton lasing from topological valleys of an organic anisotropicmicrocrystalline cavity based on tailored local nontrivial band geometry. Thispolariton laser emits light of different helicity along different angulardirections. The significantly enhanced chiral characteristics are achieved bythe nonlinear relaxation process. Helical topological polariton lasers mayprovide a perfect platform for the exploration of novel topological phenomenathat involve light-matter interaction and the development of polariton-basedspintronic devices.

Helical polariton lasing from topological valleys in an organic crystalline microcavity