Optical Control of Topological Polariton Phase in a Perovskite Lattice

TL;DR

This paper reports the experimental realization of a room-temperature, optically controllable topological polariton insulator in a perovskite lattice, enabling phase tunability and robust edge states for advanced photonic devices.

Contribution

It introduces a novel room-temperature topological polariton insulator with polarization-controlled phase tunability in a perovskite lattice, overcoming previous cryogenic and fixed-phase limitations.

Findings

Demonstrated room-temperature topological insulator with polariton states

Achieved reversible topological phase transition via polarization control

Observed topological edge state condensation under optical pumping

Abstract

Strong light-matter interaction enriches topological photonics by dressing light with matter, which provides the possibility to realize tuneable topological devices with immunity to defects. Topological exciton polaritons, half-light half-matter quasiparticles with giant optical nonlinearity represent a unique platform for active topological photonics with phase tunability. Previous demonstrations of exciton polariton topological insulators still demand cryogenic temperatures and their topological properties are usually fixed without phase tunability. Here, we experimentally demonstrate a room-temperature exciton polariton topological insulator with active phase tunability in a perovskite zigzag lattice. Polarization serves as a degree of freedom to control the reversible transition between distinct topological phases, thanks to the polarization-dependent anisotropy in halide perovskite microcavities. The topologically nontrivial polariton states localized in the edges persist in the presence of a natural defect, showing strong immunity to disorder. We further demonstrate that exciton polaritons can condense into the topological edge states under optical pumping. These results provide an ideal platform for realizing tuneable topological polaritonic devices with room-temperature operation, which can find important applications in optical control, modulation and switching.