Article Ultrafast Floquet engineering of Fermi-polaron resonances in charge-tunable monolayer WSe2 devices

Hyojin Choi ; Jinjae Kim ORCID ; Jiwon Park ; Jekwan Lee ; Wonhyeok Heo ; Jaehyeon Kwon ; Suk-Ho Lee ; Faisal Ahmed ; Kenji Watanabe SAMURAI ORCID ; Takashi Taniguchi SAMURAI ORCID ; Zhipei Sun ORCID ; Moon-Ho Jo ORCID ; Hyunyong Choi ORCID

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Hyojin Choi, Jinjae Kim, Jiwon Park, Jekwan Lee, Wonhyeok Heo, Jaehyeon Kwon, Suk-Ho Lee, Faisal Ahmed, Kenji Watanabe, Takashi Taniguchi, Zhipei Sun, Moon-Ho Jo, Hyunyong Choi. Ultrafast Floquet engineering of Fermi-polaron resonances in charge-tunable monolayer WSe2 devices. Nature Communications. 2024, 15 (1), 10852. https://doi.org/10.1038/s41467-024-55138-5

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(abstract)

Fermi polarons are emerging quasiparticles when a bosonic impurity immersed in a fermionic bath. Depending on the boson- fermion interaction strength, the Fermi-polaron resonances exhibit either attractive or repulsive interactions, which impose further experimental challenges on understanding the subtle light-driven dynamics. Here, we report the light-driven dynamics of attractive and repulsive Fermi polarons in monolayer WSe2 devices. Time-resolved polaron resonances are probed using femtosecond below-gap Floquet engineering with tunable exciton-Fermi sea interactions. While conventional optical Stark shifts are observed in the weak interaction regime, the resonance shift of attractive polarons increases, but that of repulsive polarons decreases with increasing the Fermi-sea density. A model Hamiltonian using Chevy ansatz suggests the off-resonant pump excitation influences the free carriers that interact with excitons in an opposite valley, thereby reducing the binding energy of attractive polarons. Our findings may enable coherent Floquet engineering of Bose-Fermi mixtures in ultrafast time scales.

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Keyword: Fermi polarons, light-driven dynamics, monolayer WSe2

Date published: 2024-12-30

Publisher: Springer Science and Business Media LLC

Journal:

  • Nature Communications (ISSN: 20411723) vol. 15 issue. 1 10852

Funding:

  • National Research Foundation of Korea 2021R1A2C3005905
  • National Research Foundation of Korea RS-2024-00413957
  • National Research Foundation of Korea 2019R1A5A1027055
  • National Research Foundation of Korea IBS-R034-D1
  • National Research Foundation of Korea RS-2023-00258359

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1038/s41467-024-55138-5

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Updated at: 2025-02-06 12:31:06 +0900

Published on MDR: 2025-02-06 12:31:06 +0900

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