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Generation of helical topological exciton-polaritons

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Science  08 Oct 2020:
eabc4975
DOI: 10.1126/science.abc4975

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Abstract

Topological photonics in strongly coupled light-matter systems offer the possibility for fabricating tunable optical devices that are robust against disorder and defects. Topological polaritons, i.e., hybrid exciton-photon quasiparticles, have been proposed to demonstrate scatter-free chiral propagation, but their experimental realization to date have been at deep cryogenic temperatures and under strong magnetic fields. We demonstrate helical topological polaritons up to 200 K without external magnetic field in monolayer WS2 excitons coupled to a non-trivial photonic crystal protected by pseudo time-reversal symmetry. The helical nature of the topological polaritons is verified where polaritons with opposite helicities are transported to opposite directions. Topological helical polaritons provide a platform for developing robust and tunable polaritonic spintronic devices for classical and quantum information processing applications.

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