Observation of Exciton Redshift–Blueshift Crossover
in Monolayer WS2
Posted on 2017-06-16 - 18:24
We
report a rare atom-like interaction between excitons in monolayer
WS2, measured using ultrafast absorption spectroscopy.
At increasing excitation density, the exciton resonance energy exhibits
a pronounced redshift followed by an anomalous blueshift. Using both
material-realistic computation and phenomenological modeling, we attribute
this observation to plasma effects and an attraction–repulsion
crossover of the exciton–exciton interaction that mimics the
Lennard-Jones potential between atoms. Our experiment demonstrates
a strong analogy between excitons and atoms with respect to interparticle
interaction, which holds promise to pursue the predicted liquid and
crystalline phases of excitons in two-dimensional materials.
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Sie, E. J.; Steinhoff, A.; Gies, C.; Lui, C. H.; Ma, Q.; Rösner, M.; et al. (2017). Observation of Exciton Redshift–Blueshift Crossover
in Monolayer WS2. ACS Publications. Collection. https://doi.org/10.1021/acs.nanolett.7b01034
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AUTHORS (13)
ES
E. J. Sie
AS
A. Steinhoff
CG
C. Gies
CL
C. H. Lui
QM
Q. Ma
MR
M. Rösner
GS
G. Schönhoff
FJ
F. Jahnke
TW
T. O. Wehling
YL
Y.-H. Lee
JK
J. Kong
PJ
P. Jarillo-Herrero
NG
N. Gedik