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Proceedings Paper

Biexcitons do not form in MoS2 monolayers from optical pumping at 6 K
Author(s): Ryan E. Wood; Lawson T. Lloyd; Fauzia Mujid; Lili Wang; Marco A. Allodi; Hui Gao; Richard Mazuski; Po-Chieh Ting; Saien Xie; Jiwoong Park; Gregory S. Engel
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Paper Abstract

Transition metal dichalcogenides (TMDs) have attracted much interest in recent years due to their emerging material properties. In monolayer TMDs, such as MoS2, extreme quantum confinement is achieved in the monolayer limit. Although monolayer TMDs represent an ideal platform to explore excitonic physics using ultrafast spectroscopy, this exploration is currently limited by confusion regarding the origin of certain spectral features, including the below-bandgap PIA feature observed in pump-probe experiments. In this work, we document an absence of PIA features immediately after photoexcitation, indicating a lack of strong optically-induced biexciton formation. Below-bandgap PIA features are observed to grow in with a time constant of 110 ± 10 fs, indicative of other factors responsible for their origin. These results indicate that optically-induced biexciton formation is most likely not responsible for the previously observed PIA features in MoS2 monolayers.

Paper Details

Date Published: 27 February 2020
PDF: 6 pages
Proc. SPIE 11278, Ultrafast Phenomena and Nanophotonics XXIV, 1127805 (27 February 2020); doi: 10.1117/12.2545200
Show Author Affiliations
Ryan E. Wood, Univ. of Chicago (United States)
Institute of Biophysical Dynamics (United States)
Lawson T. Lloyd, Univ. of Chicago (United States)
Institute of Biophysical Dynamics (United States)
Fauzia Mujid, Univ. of Chicago (United States)
Lili Wang, Univ. of Chicago (United States)
Institute of Biophysical Dynamics (United States)
Marco A. Allodi, Univ. of Chicago (United States)
Institute of Biophysical Dynamics (United States)
Hui Gao, Univ. of Chicago (United States)
Pritzker School of Molecular Engineering (United States)
Cornell Univ. (United States)
Richard Mazuski, Univ. of Chicago (United States)
Institute of Biophysical Dynamics (United States)
Po-Chieh Ting, Univ. of Chicago (United States)
Institute of Biophysical Dynamics (United States)
Saien Xie, Univ. of Chicago (United States)
Cornell Univ. (United States)
Jiwoong Park, Univ. of Chicago (United States)
Pritzker School of Molecular Engineering (United States)
Gregory S. Engel, Univ. of Chicago (United States)
Institute of Biophysical Dynamics (United States)


Published in SPIE Proceedings Vol. 11278:
Ultrafast Phenomena and Nanophotonics XXIV
Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)

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