Topological valley Hall polariton condensation

Kai Peng, Wei Li, Meng Sun, Jose D.H. Rivero, Chaoyang Ti, Xu Han, Li Ge, Lan Yang, Xiang Zhang, Wei Bao

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

A photonic topological insulator features robust directional propagation and immunity to defect perturbations of the edge/surface state. Exciton-polaritons, that is, the hybrid quasiparticles of excitons and photons in semiconductor microcavities, have been proposed as a tunable nonlinear platform for emulating topological phenomena. However, mainly due to excitonic material limitations, experimental observations so far have not been able to enter the nonlinear condensation regime or only show localized condensation in one dimension. Here we show a topological propagating edge state with polariton condensation at room temperature and without any external magnetic field. We overcome material limitations by using excitonic CsPbCl3 halide perovskites with a valley Hall lattice design. The polariton lattice features a large bandgap of 18.8 meV and exhibits strong nonlinear polariton condensation with clear long-range spatial coherence across the critical pumping density. The geometric parameters and material composition of our nonlinear many-body photonic system platform can in principle be tailored to study topological phenomena of other interquasiparticle interactions.

Original languageEnglish
Pages (from-to)1283-1289
Number of pages7
JournalNature Nanotechnology
Volume19
Issue number9
DOIs
StatePublished - Sep 2024

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