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  Caruso, F.; Amsalem, P.; Ma, J.; Aljarb, A.; Schultz, T.; Zacharias, M.; Tung, V.; Koch, N.; Draxl, C.: Two-dimensional plasmonic polarons in n-doped monolayer MoS₂. Physical Review B 103 (2021), p. 205152/1-11

10.1103/physrevb.103.205152
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Abstract:
We report experimental and theoretical evidence of strong electron-plasmon interaction in n-doped single-layer 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.