期刊
2D MATERIALS
卷 7, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/ab4b14
关键词
exciton-polaritons; transition metal dichalcogenides; multilayer WSe2; microcavity; strong light-matter coupling
资金
- Ministry of Higher Education Republic of Poland [0109/DIA/2015/44, 0005/DIA/2016/45]
- National Science Centre [2013/10/M/ST3/00791, 2015/18/E/ST3/00558, 2018/31/B/ST3/02111, 2018/31/N/ST3/03046]
- EU Graphene Flagship project [785219]
- ATOMOPTO project (TEAM programme of the Foundation for Polish Science - EU within the ERD Fund)
- Elemental Strategy Initiative
- CREST, JST [JPMJCR15F3]
Due to high binding energy and oscillator strength, excitons in thin flakes of transition metal dichalcogenides constitute a perfect foundation for realizing a strongly coupled light-matter system. In this paper we investigate mono- and few-layer WSe2 flakes encapsulated in hexagonal boron nitride and incorporated into a planar dielectric cavity. We use an open cavity design which provides tunability of the cavity mode energy by as much as 150 meV. We observe a strong coupling regime between the cavity photons and the neutral excitons in direct-bandgap monolayer WSe2, as well as in few-layer WSe2 flakes exhibiting indirect bandgap. We discuss the dependence of the exciton's oscillator strength and resonance linewidth on the number of layers and predict the exciton-photon coupling strength.
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