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17 March 2023 Controlling dark excitons in two-dimensional TMDs for optoelectronic applications
Gabriele Grosso, Saroj B. Chand, John M. Woods, Enrique Mejia
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Proceedings Volume PC12423, 2D Photonic Materials and Devices VI; (2023) https://doi.org/10.1117/12.2648546
Event: SPIE OPTO, 2023, San Francisco, California, United States
Abstract
We show that dark excitons in transition metal dichalcogenides (TMDs) can be controlled for optoelectronic applications. We report on the experimental observation of intervalley momentum-forbidden KΛ excitons. We show evidence that their formation and emission is related to compressive strain that activates a phonon-assisted intervalley scattering process that can be used as an ultrasensitive optical strain sensing mechanism. We also report on the repulsion-driven propagation of dark spin-forbidden excitons that, due to their permanent dipole, can travel for several microns. The unusual large distance covered by these exotic excitonic states can be further used for propagating valley and spin information across TMD samples, enabling several optoelectronic applications.
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Gabriele Grosso, Saroj B. Chand, John M. Woods, and Enrique Mejia "Controlling dark excitons in two-dimensional TMDs for optoelectronic applications", Proc. SPIE PC12423, 2D Photonic Materials and Devices VI, (17 March 2023); https://doi.org/10.1117/12.2648546
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KEYWORDS
Excitons
Optoelectronics
Electrons
Phonons
Polarization
Pollution control
Scattering
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