Two-dimensional plasmonic polarons in n-doped monolayer MoS2

TL;DR

This paper presents experimental and theoretical evidence of strong electron-plasmon interactions in n-doped monolayer MoS2, revealing plasmonic polarons and expanding the understanding of many-body effects in 2D materials.

Contribution

It provides the first combined experimental and theoretical demonstration of plasmon-induced polarons in monolayer MoS2, highlighting a new platform for studying electron-plasmon coupling.

Findings

Observation of polaronic signatures in ARPES spectra

Theoretical confirmation of electron coupling to 2D plasmons

Implication of strong electron-plasmon interactions in doped TMDs

Abstract

We report experimental and theoretical evidence of strong electron-plasmon interaction in n-doped single-layer MoS2. Angle-resolved photoemission spectroscopy (ARPES) 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 (2D) 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 2D.