期刊
NANO LETTERS
卷 18, 期 3, 页码 1777-1785出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b04965
关键词
Strong coupling; exciton; trion; TMDC; monolayer WS2
类别
资金
- Knut and Alice Wallenberg Foundation
- Engkvist Foundation
- Polish Ministry of Science and Higher Education via the Iuventus Plus Project [IP2014 000473]
- Swedish Foundation for Strategic Research [SSF RMA 11]
- Swedish Research Council (Vetenskapsomradet) [2016-06059]
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 localized surface plasmons in silver nanoprisms and excitons and trions in monolayer tungsten disulfide (WS2). 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 polaritons at the single nanoparticle level.
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