Journal article
Room Temperature Chiral Coupling of Valley Excitons with Spin-Momentum Locked Surface Plasmons
T Chervy, S Azzini, E Lorchat, S Wang, Y Gorodetski, JA Hutchison, S Berciaud, TW Ebbesen, C Genet
ACS Photonics | AMER CHEMICAL SOC | Published : 2018
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.
Grants
Awarded by Agence Nationale de la Recherche
Funding Acknowledgements
We thank David Hagenmuller for fruitful discussions. This work was supported in part by the ANR Equipex "Union" (ANR-10-EQPX-52-01), ANR Grant (I-12DH 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).