Photoexcitation dynamics and long-lived excitons in strain-engineered transition metal dichalcogenides

Anton V. Malko; Navendu Mondal; Nurul Azam; Yuri Gartstein; Masoud Mahjouri-Samani

doi:10.1117/12.2647617

17 March 2023 Photoexcitation dynamics and long-lived excitons in strain-engineered transition metal dichalcogenides

Anton V. Malko, Navendu Mondal, Nurul Azam, Yuri Gartstein, Masoud Mahjouri-Samani

Proceedings Volume PC12410, Nanoscale and Quantum Materials: From Synthesis and Laser Processing to Applications 2023; PC1241003 (2023) https://doi.org/10.1117/12.2647617
Event: SPIE LASE, 2023, San Francisco, California, United States

Abstract

Using recently developed laser-assisted synthesis technique (LAST), we demonstrate, for the first time, transient absorption (TA) exciton dynamics of W- and Mo-families of TMDs that have strong excitation fluence dependence and reach extremely long, several nanosecond lifetimes at the highest fluences. To put this in the context, all previous observations have shown tens of picosecond lifetimes at high powers (due to Auger recombination). Using a variety of experimental approaches (excitation wavelength and temperature dependent measurements) and comparing the results with TMD samples in a freestanding form, we trace our observations to the amount of strain produced in the LAST samples by the specifics of high temperature growth and substrate cooling. Using kinetic modeling, we relate these observations to the strain-induced modifications of electronic bands and associated population of intervalley dark excitons that can now interplay with intravalley (bright) excitations.

Conference Presentation

Citation Download Citation

Anton V. Malko, Navendu Mondal, Nurul Azam, Yuri Gartstein, and Masoud Mahjouri-Samani "Photoexcitation dynamics and long-lived excitons in strain-engineered transition metal dichalcogenides", Proc. SPIE PC12410, Nanoscale and Quantum Materials: From Synthesis and Laser Processing to Applications 2023, PC1241003 (17 March 2023); https://doi.org/10.1117/12.2647617

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