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15 March 2023 Formation of moiré interlayer excitons in space and time
Stefan Mathias
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Proceedings Volume PC12419, Ultrafast Phenomena and Nanophotonics XXVII; (2023) https://doi.org/10.1117/12.2651561
Event: SPIE OPTO, 2023, San Francisco, California, United States
Abstract
In my talk, I will present the ultrafast formation dynamics of dark interlayer excitons in twisted WSe2/MoS2 heterostructures in space and time. First, I will report on the identification of a hallmark signature of the moiré superlattice that is imprinted onto the momentum-resolved interlayer exciton photoemission signal. With this data, we reconstruct the electronic part of the exciton wavefunction, and relate its extension to the moiré wavelength of the heterostructure. Second, I will show that interlayer excitons are effectively formed via exciton-phonon scattering, and subsequent interlayer tunneling at the interlayer hybridized ΣW valleys on the sub-50 fs timescale.
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Stefan Mathias "Formation of moiré interlayer excitons in space and time", Proc. SPIE PC12419, Ultrafast Phenomena and Nanophotonics XXVII, (15 March 2023); https://doi.org/10.1117/12.2651561
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KEYWORDS
Excitons
Heterojunctions
Quasiparticles
Ultrafast phenomena
Crystals
Microscopy
Scattering
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