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

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 () and Hyunyong Choi ()
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Hyojin Choi: Seoul National University
Jinjae Kim: Seoul National University
Jiwon Park: Seoul National University
Jekwan Lee: Seoul National University
Wonhyeok Heo: Samsung Electronics
Jaehyeon Kwon: Samsung Electronics
Suk-Ho Lee: Pohang University of Science and Technology
Faisal Ahmed: Aalto University
Kenji Watanabe: 1-1 Namiki
Takashi Taniguchi: 1-1 Namiki
Zhipei Sun: Aalto University
Moon-Ho Jo: Pohang University of Science and Technology
Hyunyong Choi: Seoul National University

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-55138-5

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