Observation of tunable charged exciton polaritons in hybrid monolayer WS2 plasmonic nanoantenna system
arXiv:1703.07873 · doi:10.1021/acs.nanolett.7b04965
Abstract
Formation of dressed light-matter states in optical structures, manifested as Rabi splitting of the eigen energies of a coupled system, is one of the key effects in quantum optics. In pursuing this regime with semiconductors, light is usually made to interact with excitons electrically neutral quasiparticles of semiconductors, meanwhile interactions with charged three-particle states trions have received little attention. Here, we report on strong interaction between plasmons in silver nanoprisms and charged excitons trions in monolayer tungsten disulphide (WS). We show that the plasmon-exciton interactions in this system can be efficiently tuned by controlling the charged versus neutral exciton contribution to the coupling process. In particular, we show that a stable trion state emerges and couples efficiently to the plasmon resonance at low temperature by forming three bright intermixed plasmon-exciton-trion polariton states. Our findings open up a possibility to exploit electrically charged trion polaritons previously unexplored mixed states of light and matter in nanoscale hybrid plasmonic systems.
arXiv comment31 pages, 11 figures, Main text, Supplementary Info
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