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Rydberg Excitons and Trions in Monolayer MoTe2

Published

Author(s)

Souvik Biswas, Aurélie Champagne, Jonah Haber, supavit pokawanvit, Joeson Wong, Hamidreza Akbari, Sergiy Krylyuk, Kenji Watanabe, Albert Davydov, Zakaria Al Balushi, Felipe H. da Jornada, Diana Qiu, Jeffrey Neaton, Harry Atwater

Abstract

Monolayer transition metal dichalcogenide (TMDC) semiconductors exhibit strong excitonic optical resonances which serve as a microscopic, non-invasive probe into their fundamental properties. Like the hydrogen atom, such excitons can exhibit an entire Rydberg series of resonances. Excitons have been extensively studied in most TMDCs (MoS2, MoSe2, WS2 and WSe2), but detailed exploration of excitonic phenomena has been lacking in the important TMDC material molybdenum ditelluride (MoTe2). Here, we report an experimental investigation of excitonic luminescence properties of monolayer MoTe2 to understand the excitonic Rydberg series, up to 3s. We report significant modification of emission energies with temperature (4 K to 300 K), quantifying the exciton-phonon coupling. Furthermore, we observe a strongly gate-tunable exciton-trion interplay for all the Rydberg states governed mainly by free-carrier screening, Pauli blocking, and band-gap renormalization in agreement with the results of first-principles GW plus Bethe-Salpeter equation approach calculations. Our results help bring monolayer MoTe2 closer to its potential applications in near-infrared optoelectronics and photonic devices.
Citation
ACS Nano
Volume
17

Keywords

transition metal dichalcogenides, MoTe2, excitons, trions

Citation

Biswas, S. , Champagne, A. , Haber, J. , pokawanvit, S. , Wong, J. , Akbari, H. , Krylyuk, S. , Watanabe, K. , Davydov, A. , Al Balushi, Z. , H. da Jornada, F. , Qiu, D. , Neaton, J. and Atwater, H. (2023), Rydberg Excitons and Trions in Monolayer MoTe2, ACS Nano, [online], https://doi.org/10.1021/acsnano.3c00145, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=935959 (Accessed April 17, 2024)
Created April 12, 2023, Updated May 1, 2023