Many-body effect in optical properties of monolayer molybdenum diselenide
Ke Xiao, Tengfei Yan, Qiye Liu, Siyuan Yang, Chiming Kan, Ruihuan, Duan, Zheng Liu, Xiaodong Cui
TL;DR
This study investigates the many-body effects on excitons in monolayer MoSe2 using photoluminescence and reflectance, revealing polaronic behaviors and complex excitonic interactions beyond simple models.
Contribution
It provides experimental evidence of Fermi polaron modes and highlights the limitations of traditional three-particle models in describing excitonic states in monolayer MoSe2.
Findings
Observation of repulsive and attractive Fermi polaron modes.
Validation of polaronic behavior in excitonic states.
Inadequacy of simple three-particle trion models.
Abstract
Excitons in monolayer transition metal dichalcogenide (TMD) provide a paradigm of composite Boson in 2D system. This letter reports a photoluminescence and reflectance study of excitons in monolayer molybdenum diselenide (MoSe2) with electrostatic gating. We observe the repulsive and attractive Fermi polaron modes of the band edge exciton, its excited state and the spin-off excitons. Our data validate the polaronic behavior of excitonic states in the system quantitatively where the simple three-particle trion model is insufficient to explain.
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Taxonomy
Topics2D Materials and Applications · Perovskite Materials and Applications · Quantum Dots Synthesis And Properties