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arXiv · 1703.07873

Observation of tunable charged exciton polaritons in hybrid monolayer WS2 $-$ plasmonic nanoantenna system

Jorge Cuadra·Denis G. Baranov·Martin Wersäll·Ruggero Verre·Tomasz J. Antosiewicz·Timur Shegai
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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$_{2}$). 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.

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Jorge Cuadra, Denis G. Baranov, Martin Wersäll, Ruggero Verre, Tomasz J. Antosiewicz, Timur Shegai. 2017-03-22. Observation of tunable charged exciton polaritons in hybrid monolayer WS2 $-$ plasmonic nanoantenna system. https://doi.org/10.1021/acs.nanolett.7b04965

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