Helical polariton lasing from topological valleys in an organic crystalline microcavity

TL;DR

This paper demonstrates helical polariton lasing from topological valleys in an organic microcavity, showcasing robust, direction-dependent, chiral light emission enabled by nontrivial band geometry and nonlinear relaxation.

Contribution

It introduces a novel topological polariton laser with helicity control based on tailored band geometry in an organic microcrystalline cavity.

Findings

Helical polariton lasing observed with direction-dependent helicity.

Enhanced chiral characteristics via nonlinear relaxation.

Potential for topological phenomena and spintronic device applications.

Abstract

Topological photonics provides an important platform for the development of photonic devices with robust disorder-immune light transport and controllable helicity. Mixing photons with excitons (or polaritons) gives rise to nontrivial polaritonic bands with chiral modes, allowing the manipulation of helical lasers in strongly coupled light-matter systems. In this work, we demonstrate helical polariton lasing from topological valleys of an organic anisotropic microcrystalline cavity based on tailored local nontrivial band geometry. This polariton laser emits light of different helicity along different angular directions. The significantly enhanced chiral characteristics are achieved by the nonlinear relaxation process. Helical topological polariton lasers may provide a perfect platform for the exploration of novel topological phenomena that involve light-matter interaction and the development of polariton-based spintronic devices.