Ultrafast Floquet engineering of Fermi-polaron resonances in charge-tunable monolayer WSe2 devices
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 understandi...
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Nature Portfolio
2024-12-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-024-55138-5 |
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| author | 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 |
| author_facet | 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 |
| author_sort | Hyojin Choi |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-db88bc8271b04c00821865e365c53f07 |
| institution | Kabale University |
| issn | 2041-1723 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj-art-db88bc8271b04c00821865e365c53f072025-01-05T12:34:31ZengNature PortfolioNature Communications2041-17232024-12-011511710.1038/s41467-024-55138-5Ultrafast Floquet engineering of Fermi-polaron resonances in charge-tunable monolayer WSe2 devicesHyojin Choi0Jinjae Kim1Jiwon Park2Jekwan Lee3Wonhyeok Heo4Jaehyeon Kwon5Suk-Ho Lee6Faisal Ahmed7Kenji Watanabe8Takashi Taniguchi9Zhipei Sun10Moon-Ho Jo11Hyunyong Choi12Department of Physics and Astronomy, Seoul National UniversityDepartment of Physics and Astronomy, Seoul National UniversityDepartment of Physics and Astronomy, Seoul National UniversityDepartment of Physics and Astronomy, Seoul National UniversitySemiconductor R&D Center, Samsung ElectronicsSemiconductor R&D Center, Samsung ElectronicsDepartment of Materials Science and Engineering, Pohang University of Science and TechnologyDepartment of Electronics and Nanoengineering and QTF Centre of Excellence, Aalto UniversityAdvanced Materials Laboratory, National Institute for Materials Science, 1-1 NamikiAdvanced Materials Laboratory, National Institute for Materials Science, 1-1 NamikiDepartment of Electronics and Nanoengineering and QTF Centre of Excellence, Aalto UniversityDepartment of Materials Science and Engineering, Pohang University of Science and TechnologyDepartment of Physics and Astronomy, Seoul National UniversityAbstract 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.https://doi.org/10.1038/s41467-024-55138-5 |
| spellingShingle | 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 |
| title | Ultrafast Floquet engineering of Fermi-polaron resonances in charge-tunable monolayer WSe2 devices |
| title_full | Ultrafast Floquet engineering of Fermi-polaron resonances in charge-tunable monolayer WSe2 devices |
| title_fullStr | Ultrafast Floquet engineering of Fermi-polaron resonances in charge-tunable monolayer WSe2 devices |
| title_full_unstemmed | Ultrafast Floquet engineering of Fermi-polaron resonances in charge-tunable monolayer WSe2 devices |
| title_short | Ultrafast Floquet engineering of Fermi-polaron resonances in charge-tunable monolayer WSe2 devices |
| title_sort | ultrafast floquet engineering of fermi polaron resonances in charge tunable monolayer wse2 devices |
| url | https://doi.org/10.1038/s41467-024-55138-5 |
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