Ground and Excited Exciton Polarons in Monolayer MoSe2

Abstract

Monolayer transition metal dichalcogenide semiconductors, with versatile experimentally accessible exciton species, offer an interesting platform for investigating the interaction between excitons and a Fermi sea of charges. Using hexagonal boron nitride encapsulated monolayer MoSe2, we study the impact of charge density tuning on the ground and excited Rydberg states in the atomic layer. Consistent excitonpolaron behavior is revealed in both photoluminescence and reflection spectra of the A exciton 1s (A:1s) Rydberg state, in contrast to previous studies. The A:2s Rydberg state provides an opportunity to understand such interactions with greatly reduced exciton binding energy. We found that the impact of the Fermi sea becomes much more dramatic. With a photoluminescence upconversion technique, we further verify the 2s polaron-like behavior for the repulsive branch of B:2s exciton whose energy is well above the bare bandgap. Our studies show that the polaron-like interaction features are quite generic and highly robust, offering key insights into the dressed manybody state in a Fermi sea.

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Cited by in corpus (19)

• Electron-exciton interactions in the exciton-polaron problem
• Autoionization and dressing of excited excitons by free carriers in monolayer WSe2
• Enhancement of Exciton Valley Polarization in Monolayer MoS2 Induced by Scattering
• Up- and Down-Conversion between Intra- and Inter-Valley Excitons in Waveguide Coupled Monolayer WSe2
• Magnetoexcitons in transition-metal dichalcogenides monolayers, bilayers, and van der Waals heterostructures
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• Trion-phonon interaction in atomically thin semiconductors
• Excited Rydberg States in TMD Heterostructures
• Many-body effect in optical properties of monolayer molybdenum diselenide