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1 August 2021 Investigating the role of dark excitons on electron-hole liquid photoluminescence in monolayer transition-metal dichalcogenides
Ryan Wilmington, Hossein Ardekani, Avinash Rustagi, Alexander Bataller, Alexander F Kemper, Robert A Younts, Kenan Gundogdu
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Proceedings Volume 11800, Low-Dimensional Materials and Devices 2021; 118000X (2021) https://doi.org/10.1117/12.2594949
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States
Abstract
Recent theoretical and experimental work on monolayer transition-metal dichalcogenides show that optical excitation and strain leads to a transition from an excitonic to electron-hole liquid (EHL) phase. This phase transition is accompanied by a huge (23-fold) increase in photoluminescence (PL) but so far a mechanism has not been confirmed. Here, authors investigate how dark excitons beyond the light cone may influence the PL response of 1L-MoS2 in the excitonic vs EHL regime. They predict that in the excitonic to plasma transition, intraband collisions redefine the effective light cone of optically accessible carriers. Also, sample strain is shown to impact the spectral positions of bright and dark exciton transitions by way of altering the momentum space band positions of 1L-MoS2, increasing the ratio of bright carriers within the light cone.
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Ryan Wilmington, Hossein Ardekani, Avinash Rustagi, Alexander Bataller, Alexander F Kemper, Robert A Younts, and Kenan Gundogdu "Investigating the role of dark excitons on electron-hole liquid photoluminescence in monolayer transition-metal dichalcogenides", Proc. SPIE 11800, Low-Dimensional Materials and Devices 2021, 118000X (1 August 2021); https://doi.org/10.1117/12.2594949
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KEYWORDS
Excitons
Liquids
Luminescence
Quantum efficiency
Laser optics
Absorption spectroscopy
Plasma
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