We report experimental and theoretical evidence of strong electron-plasmon interaction in n-doped singlelayer MoS2. Angle-resolved photoemission spectroscopy measurements reveal the emergence of distinctive signatures of polaronic coupling in the electron spectral function. Calculations based on many-body perturbation theory illustrate that electronic coupling to two-dimensional carrier plasmons provides an exhaustive explanation of the experimental spectral features and their energies. These results constitute compelling evidence of the formation of plasmon-induced polaronic quasiparticles, suggesting that highly doped transition-metal dichalcogenides may provide a new platform to explore strong-coupling phenomena between electrons and plasmons in two dimensions.
Bibliographical noteKAUST Repository Item: Exported on 2021-06-05
Acknowledged KAUST grant number(s): OSR2018-CARF/CCF-3079
Acknowledgements: This work was funded by the Deutsche Forschungsgemeinschaft (DFG) – Projektnummer 182087777 – SFB 951. FC acknowledges useful discussions with Pasquale Pavone. AA and VT are indebted to the support from the KAUST Office of Sponsored Research (OSR) under Award No: OSR2018-CARF/CCF-3079. MZ acknowledges support by the Research Promotion Foundation of the Republic of Cyprus under Award: NEW INFRASTRUCTURE/ΣTPATH/0308/04 and the DECI resource Saniyer at UHeM based in Turkey [http://en.uhem.itu.edu.tr] with support from the PRACE aisbl