Trion formation dynamics in monolayer transition metal dichalcogenides
Journal article, 2016
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.
Author
A. Singh
University of Texas
G. Moody
University of Texas
K. Tran
University of Texas
M.E. Scott
University of Washington
V. Overbeck
Technische Universität Berlin
Gunnar Berghäuser
Technische Universität Berlin
J. Schaibley
University of Washington
E.J. Seifert
University of Texas
D. Pleskot
University of California
N.M. Gabor
University of California
J. Yan
University of Tennessee
Oak Ridge National Laboratory
D.G. Mandrus
University of Tennessee
Oak Ridge National Laboratory
M. Richter
Technische Universität Berlin
Ermin Malic
Chalmers, Physics, Condensed Matter Theory
X. Xu
University of Washington
X. Li
University of Texas
Physical Review B
24699950 (ISSN) 24699969 (eISSN)
Vol. 93 4 041401Graphene-Based Revolutions in ICT And Beyond (Graphene Flagship)
European Commission (EC) (EC/FP7/604391), 2013-10-01 -- 2016-03-31.
Subject Categories (SSIF 2011)
Condensed Matter Physics
DOI
10.1103/PhysRevB.93.041401