期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 32, 期 12, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-648X/ab5907
关键词
plasmon; two dimensional materials; plasmon-phonon coupling
资金
- National Natural Science Foundation of China [11604380, 11774416]
- China Scholarship Council
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX19_2192]
- Postgraduate Research & Practice Innovation Program of China University of Mining and Technology [KYCX19_2192]
We present a theoretical study of the plasmon-phonon coupling in a suspended monolayer MoS2 and a MoS2 substrate system using a diagrammatic self-consistent field theory. The four coupled plasmon-phonon modes and the four plasmon-surface phonon modes are observed due to the spin-orbit and electron-optic phonon interactions. The two of coupled plasmon-phonon and plasmon-surface phonon modes are optic-like and the other two are acoustic-like. The plasmon are strongly coupled with the optic-phonon in MoS2 and the surface optic-phonon in the substrates as the electron density or wave-vector increases. The strong plasmon-phonon coupling shows that the optoelectronic properties of monolayer MoS2 are evidently modulated by electron-phonon interactions. The hybrid plasmon-phonon polaritons can be achieved by strong light-mater interactions. This study is relevant to the application of MoS2 as novel plasmonic and nanophotonic devices.
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