Biexcitons do not form in MoS2 monolayers from optical pumping at 6 K

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

doi:10.1117/12.2545200

27 February 2020 Biexcitons do not form in MoS₂ monolayers from optical pumping at 6 K

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

Author Affiliations +

Proceedings Volume 11278, Ultrafast Phenomena and Nanophotonics XXIV; 1127805 (2020) https://doi.org/10.1117/12.2545200
Event: SPIE OPTO, 2020, San Francisco, California, United States

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.

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Ryan E. Wood, Lawson T. Lloyd, Fauzia Mujid, Lili Wang, Marco A. Allodi, Hui Gao, Richard Mazuski, Po-Chieh Ting, Saien Xie, Jiwoong Park, and Gregory S. Engel "Biexcitons do not form in MoS₂ monolayers from optical pumping at 6 K", Proc. SPIE 11278, Ultrafast Phenomena and Nanophotonics XXIV, 1127805 (27 February 2020); https://doi.org/10.1117/12.2545200

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