Trion formation dynamics in monolayer transition metal dichalcogenides

Akshay Singh; Galan Moody; Kha Tran; Marie E. Scott; Vincent Overbeck; Gunnar Berghäuser; John Schaibley; Edward J. Seifert; Dennis Pleskot; Nathaniel M. Gabor; Jiaqiang Yan; David G. Mandrus; Marten Richter; Ermin Malic; Xiaodong Xu; Xiaoqin Li

doi:10.1103/PhysRevB.93.041401

Trion formation dynamics in monolayer transition metal dichalcogenides

Akshay Singh, Galan Moody, Kha Tran, Marie E. Scott, Vincent Overbeck, Gunnar Berghäuser, John Schaibley, Edward J. Seifert, Dennis Pleskot, Nathaniel M. Gabor, Jiaqiang Yan, David G. Mandrus, Marten Richter, Ermin Malic, Xiaodong Xu, Xiaoqin Li

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

168 Scopus citations

Abstract

We report charged exciton (trion) formation dynamics in doped monolayer transition metal dichalcogenides, specifically molybdenum diselenide (MoSe2), using resonant two-color pump-probe spectroscopy. When resonantly pumping the exciton transition, trions are generated on a picosecond time scale through exciton-electron interaction. As the pump energy is tuned from the high energy to low energy side of the inhomogeneously broadened exciton resonance, the trion formation time increases by ∼50%. This feature can be explained by the existence of both localized and delocalized excitons in a disordered potential and suggests the existence of an exciton mobility edge in transition metal dichalcogenides.

Original language	English (US)
Article number	041401
Journal	Physical Review B
Volume	93
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevB.93.041401
State	Published - Jan 5 2016
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.93.041401

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title = "Trion formation dynamics in monolayer transition metal dichalcogenides",

abstract = "We report charged exciton (trion) formation dynamics in doped monolayer transition metal dichalcogenides, specifically molybdenum diselenide (MoSe2), using resonant two-color pump-probe spectroscopy. When resonantly pumping the exciton transition, trions are generated on a picosecond time scale through exciton-electron interaction. As the pump energy is tuned from the high energy to low energy side of the inhomogeneously broadened exciton resonance, the trion formation time increases by ∼50%. This feature can be explained by the existence of both localized and delocalized excitons in a disordered potential and suggests the existence of an exciton mobility edge in transition metal dichalcogenides.",

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doi = "10.1103/PhysRevB.93.041401",

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T1 - Trion formation dynamics in monolayer transition metal dichalcogenides

AU - Singh, Akshay

AU - Moody, Galan

AU - Tran, Kha

AU - Scott, Marie E.

AU - Overbeck, Vincent

AU - Berghäuser, Gunnar

AU - Schaibley, John

AU - Seifert, Edward J.

AU - Pleskot, Dennis

AU - Gabor, Nathaniel M.

AU - Yan, Jiaqiang

AU - Mandrus, David G.

AU - Richter, Marten

AU - Malic, Ermin

AU - Xu, Xiaodong

AU - Li, Xiaoqin

PY - 2016/1/5

Y1 - 2016/1/5

N2 - We report charged exciton (trion) formation dynamics in doped monolayer transition metal dichalcogenides, specifically molybdenum diselenide (MoSe2), using resonant two-color pump-probe spectroscopy. When resonantly pumping the exciton transition, trions are generated on a picosecond time scale through exciton-electron interaction. As the pump energy is tuned from the high energy to low energy side of the inhomogeneously broadened exciton resonance, the trion formation time increases by ∼50%. This feature can be explained by the existence of both localized and delocalized excitons in a disordered potential and suggests the existence of an exciton mobility edge in transition metal dichalcogenides.

AB - We report charged exciton (trion) formation dynamics in doped monolayer transition metal dichalcogenides, specifically molybdenum diselenide (MoSe2), using resonant two-color pump-probe spectroscopy. When resonantly pumping the exciton transition, trions are generated on a picosecond time scale through exciton-electron interaction. As the pump energy is tuned from the high energy to low energy side of the inhomogeneously broadened exciton resonance, the trion formation time increases by ∼50%. This feature can be explained by the existence of both localized and delocalized excitons in a disordered potential and suggests the existence of an exciton mobility edge in transition metal dichalcogenides.

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Trion formation dynamics in monolayer transition metal dichalcogenides

Abstract

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