Coherent Topological Polariton Laser

Topological concepts have been applied to a wide range of fields in order to successfully describe the emergence of robust edge modes that are unaffected by scattering or disorder. In photonics, indications of lasing from topologically protected modes with improved overall laser characteristics were observed. Here, we study exciton-polariton microcavity traps that are arranged in a one-dimensional Su-Schrieffer-Heeger lattice and form a topological defect mode from which we unequivocally observe highly coherent polariton lasing. Additionally, we confirm the excitonic contribution to the polariton lasing by applying an external magnetic field. These systematic experimental findings of robust lasing and high temporal coherence are meticulously reproduced by a combination of a generalized Gross-Pitaevskii model and a Lindblad master equation model. Thus, by using the comparatively simple SSH geometry, we are able to describe and control the exciton-polariton topological lasing, allowing for a deeper understanding of topological effects on microlasers.

Automated summary

The study focuses on topological defect modes in a one-dimensional Su-Schrieffer-Heeger lattice, observing highly coherent polariton lasing and confirming excitonic contribution through the application of an external magnetic field. Experimental findings of robust lasing and high temporal coherence are accurately reproduced by a combination of models, providing deeper insight into topological effects on microlasers.