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 language | English |
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Pages (from-to) | 1281-1287 |
Number of pages | 7 |
Journal | ACS Photonics |
Volume | 5 |
Issue number | 4 |
DOIs | |
Publication status | Published - 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).