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Room Temperature Chiral Coupling of Valley Excitons with Spin-Momentum Locked Surface Plasmons

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posted on 2018-01-25, 00:00 authored by Thibault Chervy, Stefano Azzini, Etienne Lorchat, Shaojun Wang, Yuri Gorodetski, James A. Hutchison, Stéphane Berciaud, Thomas W. Ebbesen, Cyriaque Genet
We demonstrate room temperature chiral coupling of valley excitons in a transition metal dichalcogenide monolayer with spin-momentum locked surface plasmons. At the onset of the strong coupling regime, we measure spin-selective excitation of directional flows of polaritons. Operating under such conditions, our platform yields surprisingly robust intervalley contrasts (ca. 40%) and coherence (ca. 5–8%) as opposed to their total absence for the uncoupled valley excitons at room temperature. These results open rich possibilities, easy to implement, in the context of chiral optical networks.

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