Many-Body Effect on Optical Properties of Monolayer Molybdenum Diselenide

Ke Xiao; Tengfei Yan; Qiye Liu; Siyuan Yang; Chiming Kan; Ruihuan Duan; Zheng Liu; Xiaodong Cui

doi:10.1021/acs.jpclett.1c00320

Many-Body Effect on Optical Properties of Monolayer Molybdenum Diselenide

Ke Xiao, Tengfei Yan^*, Qiye Liu, Siyuan Yang, Chiming Kan, Ruihuan Duan, Zheng Liu, Xiaodong Cui^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

Excitons in monolayer transition metal dichalcogenides (TMDs) provide a paradigm of composite Boson in a two-dimensional 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, which the simple three-particle trion model is insufficient to explain. The contrasting energy shift between the exciton and charge-bound excitons (repulsive and attractive polaron modes) and the remarkably different gate dependence of the polaron energy splitting between the ground state and the excited state excitons unambiguously support the Fermi polaron picture for excitons in monolayer TMDs.

Original language	English
Pages (from-to)	2555-2561
Number of pages	7
Journal	Journal of Physical Chemistry Letters
Volume	12
Issue number	10
DOIs	https://doi.org/10.1021/acs.jpclett.1c00320
Publication status	Published - Mar 18 2021
Externally published	Yes

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ASJC Scopus Subject Areas

General Materials Science
Physical and Theoretical Chemistry

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10.1021/acs.jpclett.1c00320

Cite this

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title = "Many-Body Effect on Optical Properties of Monolayer Molybdenum Diselenide",

abstract = "Excitons in monolayer transition metal dichalcogenides (TMDs) provide a paradigm of composite Boson in a two-dimensional 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, which the simple three-particle trion model is insufficient to explain. The contrasting energy shift between the exciton and charge-bound excitons (repulsive and attractive polaron modes) and the remarkably different gate dependence of the polaron energy splitting between the ground state and the excited state excitons unambiguously support the Fermi polaron picture for excitons in monolayer TMDs.",

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T1 - Many-Body Effect on Optical Properties of Monolayer Molybdenum Diselenide

AU - Xiao, Ke

AU - Yan, Tengfei

AU - Liu, Qiye

AU - Yang, Siyuan

AU - Kan, Chiming

AU - Duan, Ruihuan

AU - Liu, Zheng

AU - Cui, Xiaodong

PY - 2021/3/18

Y1 - 2021/3/18

N2 - Excitons in monolayer transition metal dichalcogenides (TMDs) provide a paradigm of composite Boson in a two-dimensional 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, which the simple three-particle trion model is insufficient to explain. The contrasting energy shift between the exciton and charge-bound excitons (repulsive and attractive polaron modes) and the remarkably different gate dependence of the polaron energy splitting between the ground state and the excited state excitons unambiguously support the Fermi polaron picture for excitons in monolayer TMDs.

AB - Excitons in monolayer transition metal dichalcogenides (TMDs) provide a paradigm of composite Boson in a two-dimensional 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, which the simple three-particle trion model is insufficient to explain. The contrasting energy shift between the exciton and charge-bound excitons (repulsive and attractive polaron modes) and the remarkably different gate dependence of the polaron energy splitting between the ground state and the excited state excitons unambiguously support the Fermi polaron picture for excitons in monolayer TMDs.

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Many-Body Effect on Optical Properties of Monolayer Molybdenum Diselenide

Abstract

Bibliographical note

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