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- W4382491007 abstract "We show that the spontaneous emission rate of the interlayer excitons in a twisted WSe2-MoSe2 heterobilayer can be precisely tailored in a low-temperature open optical microcavity via the Purcell effect. We engineer the local density of optical states in our resonator structures in two complementary experimental settings. In the first approach, we utilize an ultra-low quality factor planar vertical cavity structure, which develops multiple longitudinal modes that can be consecutively brought to resonance with the broad interlayer exciton spectrum of our heterostructure. Time-resolved photoluminescence measurements reveal that the interlayer exciton lifetime can thus be periodically tuned with an amplitude of around 100 ps. The resulting oscillations of the exciton lifetime allows us to extract a free-space radiative exciton lifetime of 2.2 ns and an approximately 15 % quantum efficiency of the interlayer excitons. We subsequently engineered the local density of optical states by introducing a spatially confined and fully spectrally tunable Tamm-plasmon resonance. The dramatic redistribution of the local optical modes in this setting allows us to encounter a profound inhibition of spontaneous emission of the interlayer excitons by a factor of 3.3. Our results will further boost the cavity-mediated collective emission phenomena such as super-radiance. We expect that specifically engineering the inhibition of radiation from moire excitons is a powerful tool to steer their thermalization, and eventually their condensation into coherent condensate phases." @default.
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- W4382491007 date "2023-06-26" @default.
- W4382491007 modified "2023-10-16" @default.
- W4382491007 title "Controlling the radiation dynamics of MoSe2/WSe2 interlayer excitons via in-situ tuning the electromagnetic environment" @default.
- W4382491007 doi "https://doi.org/10.48550/arxiv.2306.15101" @default.
- W4382491007 hasPublicationYear "2023" @default.
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