Autoionization and dressing of excited excitons by free carriers in monolayer WSe2

Abstract

We experimentally demonstrate dressing of the excited exciton states by a continuously tunable Fermi sea of free charge carriers in a monolayer semiconductor. It represents an unusual scenario of two-particle excitations of charged excitons previously inaccessible in conventional material systems. We identify excited state trions, accurately determine their binding energies in the zero-density limit for both electron- and hole-doped regimes, and observe emerging many-body phenomena at elevated doping. Combining experiment and theory we gain access to the intra-exciton coupling facilitated by the interaction with free charge carriers. We provide evidence for a process of autoionization for quasiparticles, a unique scattering pathway available for excited states in atomic systems. Finally, we demonstrate a complete transfer of the optical transition strength from the excited excitons to dressed excitons, Fermi polarons, as well as the associated light emission from their non-equilibrium populations.

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Cited by in corpus (17)

• Electron-exciton interactions in the exciton-polaron problem
• Exciton optics, dynamics and transport in atomically thin semiconductors
• Observation of Rydberg moiré excitons
• Quantum Dynamics of Attractive and Repulsive Polarons in a Doped MoSe${}_2$ Monolayer
• Electron recoil effect in electrically tunable MoSe2 monolayers
• Excitonic theory of doping-dependent optical response in atomically thin semiconductors
• Trion-trion annihilation in monolayer WS${}_2$
• Interplay of valley polarized dark trion and dark exciton-polaron in monolayer WSe2
• Trion formation resolves observed peak shifts in the optical spectra of transition metal dichalcogenides
• Valley-mediated singlet- and triplet-polaron interactions and quantum dynamics in a doped WSe${}_2$ monolayer
• Magneto-Optical Measurements of the Negatively Charged 2$s$ Exciton in WSe${}_2$
• Doping-induced non-Markovian interference causes excitonic linewidth broadening in monolayer WSe${}_2$
• Interlayer Fermi polarons of excited exciton states in quantizing magnetic fields
• Energy shifts and broadening of excitonic resonances in electrostatically-doped semiconductors
• Terahertz radiation induced attractive-repulsive Fermi polaron conversion in transition metal dichalcogenide monolayers
• Gate-modulated reflectance spectroscopy for detecting excitonic species in two-dimensional semiconductors
• Trion-phonon interaction in atomically thin semiconductors