Room temperature chiral coupling of valley excitons with spin-momentum locked surface plasmons

Thibault Chervy, Stefano Azzini, Etienne Lorchat, Shaojun Wang, Yuri Gorodetski, James A. Hutchison, Stéphane Berciaud, Thomas W. Ebbesen, Cyriaque Genet

Research output: Contribution to journalArticleAcademicpeer-review

133 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1281-1287
Number of pages7
JournalACS Photonics
Volume5
Issue number4
DOIs
Publication statusPublished - 18 Apr 2018

Funding

We thank David Hagenmüller for fruitful discussions. This work was supported in part by the ANR Equipex “Union” (ANR-10-EQPX-52-01), ANR Grant (H2DH ANR-15-CE24-0016), the Labex NIE projects (ANR-11-LABX-0058-NIE), and USIAS within the Investissement d’Avenir program ANR-10-IDEX-0002-02. Y.G. acknowledges support from the Ministry of Science, Technology and Space, Israel. C.G. and Y.G. acknowledge additional support form the French CNRS and the Israeli MOST through a PICS-PRC grant. S.B. is a member of the Institut Universitaire de France (IUF).

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