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Strong light-matter interaction enriches topological photonics by dressinglight with matter, which provides the possibility to realize tuneabletopological devices with immunity to defects. Topological exciton polaritons,half-light half-matter quasiparticles with giant optical nonlinearity representa unique platform for active topological photonics with phase tunability.Previous demonstrations of exciton polariton topological insulators stilldemand cryogenic temperatures and their topological properties are usuallyfixed without phase tunability. Here, we experimentally demonstrate aroom-temperature exciton polariton topological insulator with active phasetunability in a perovskite zigzag lattice. Polarization serves as a degree offreedom to control the reversible transition between distinct topologicalphases, thanks to the polarization-dependent anisotropy in halide perovskitemicrocavities. The topologically nontrivial polariton states localized in theedges persist in the presence of a natural defect, showing strong immunity todisorder. We further demonstrate that exciton polaritons can condense into thetopological edge states under optical pumping. These results provide an idealplatform for realizing tuneable topological polaritonic devices withroom-temperature operation, which can find important applications in opticalcontrol, modulation and switching.

Optical Control of Topological Polariton Phase in a Perovskite Lattice