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Trion formation dynamics in monolayer transition metal dichalcogenides

A. Singh ; G. Moody ; K. Tran ; M.E. Scott ; V. Overbeck ; G. Berghäuser ; J. Schaibley ; E.J. Seifert ; D. Pleskot ; N.M. Gabor ; J. Yan ; D.G. Mandrus ; M. Richter ; Ermin Malic (Institutionen för fysik, Kondenserade materiens teori (Chalmers)) ; X. Xu ; X. Li
Physical Review B. Condensed Matter and Materials Physics (1098-0121). Vol. 93 (2016), 4,
[Artikel, refereegranskad vetenskaplig]

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.



Denna post skapades 2016-02-29. Senast ändrad 2016-02-29.
CPL Pubid: 232531

 

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Institutioner (Chalmers)

Institutionen för fysik, Kondenserade materiens teori (Chalmers)

Ämnesområden

Den kondenserade materiens fysik

Chalmers infrastruktur

 


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Denna publikation är ett resultat av följande projekt:


Graphene-Based Revolutions in ICT And Beyond (GRAPHENE) (EC/FP7/604391)