Plasmon–phonon coupling in monolayer WS{sub 2}
- Jiangsu Key Laboratory for Design and Fabrication of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing 211189 (China)
- Department of Physics and Jiangsu Key Laboratory for Advanced Metallic Materials, Nanjing 211189 (China)
The excitation of plasmon in metallic nanostructures produces intense and strongly localized near fields that enhance light-matter interaction. Here, we report plasmon–phonon coupling in monolayer WS{sub 2} deposited with gold and silver nanoparticles. The Raman spectra reveal phonon modes arising from the coupling between plasmon and WS{sub 2}. The localized surface plasmon resonance mediated excitation activates the Raman process without requiring defect for momentum conservation. Our results also reveal that the momentum induced by localized surface plasmon resonances losses to WS{sub 2} and the metal atoms adsorption modulated spin–orbit split are the two essential elements for the observed plasmon–phonon coupling. This work will open up exciting prospects for plasmon–phonon coupling in two dimensional systems.
- OSTI ID:
- 22591500
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 13 Vol. 108; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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