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3 August 2021 Electrically tunable Rydberg series excitonic and trionic luminescence in monolayer MoTe2
Souvik Biswas, Zakaria Y. Al Balushi, Joeson Wong, Eoin Caffrey, Sergiy Krylyuk, Pin Chieh Wu, Hamidreza Akbari, Takashi Taniguchi, Kenji Watanabe, Albert Davydov, Harry A. Atwater
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Proceedings Volume 11800, Low-Dimensional Materials and Devices 2021; 118000V (2021) https://doi.org/10.1117/12.2594391
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States
Abstract
Non-hydrogenic Rydberg series associated with excitons have been identified in ultraclean monolayer TMDCs. Here, we investigated the radiative properties of the excitonic Rydberg series in monolayer MoTe2 based devices and the influence of Fermi level position on the same. Using low temperature (4K) photoluminescence measurements, we observed bright emission from the first three states of the excitonic Rydberg series, namely A1s, 2s and 3s. Upon doping on either electron or hole side, oscillator strengths are rapidly transferred to the corresponding trion (charged exciton/attractive polaron) states associated with the aforementioned neutral excitonic resonances. Energy shifts between different states are observed as a function of gate voltage, indicating strong band-structure renormalization. Our work identifies MoTe2 as a novel platform to realize highly tunable bright light sources or electro-optic modulators in the NIR.
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Souvik Biswas, Zakaria Y. Al Balushi, Joeson Wong, Eoin Caffrey, Sergiy Krylyuk, Pin Chieh Wu, Hamidreza Akbari, Takashi Taniguchi, Kenji Watanabe, Albert Davydov, and Harry A. Atwater "Electrically tunable Rydberg series excitonic and trionic luminescence in monolayer MoTe2", Proc. SPIE 11800, Low-Dimensional Materials and Devices 2021, 118000V (3 August 2021); https://doi.org/10.1117/12.2594391
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KEYWORDS
Luminescence
Doping
Electrooptic modulators
Light sources
Modulation
Oscillators
Polarons
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