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  Excitonic enhancement of cavity-mediated interactions in a two-band Hubbard model

Wang, X., Jaksch, D., & Schlawin, F. (2024). Excitonic enhancement of cavity-mediated interactions in a two-band Hubbard model. Physical Review B, 109(11): 115137. doi:10.1103/PhysRevB.109.115137.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000E-0D66-2 Version Permalink: https://hdl.handle.net/21.11116/0000-000F-0653-D
Genre: Journal Article

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PhysRevB.109.115137.pdf (Publisher version), 3MB
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© the Author(s). Published by the American Physical Society
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https://arxiv.org/abs/2310.12626 (Preprint)
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https://doi.org/10.1103/PhysRevB.109.115137 (Publisher version)
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 Creators:
Wang, X.1, 2, Author
Jaksch, D.1, 3, 4, Author
Schlawin, F.3, 4, 5, Author           
Affiliations:
1Department of Physics, University of Oxford, ou_persistent22              
2Max Planck Institute for the Structure and Dynamics of Matter, ou_persistent22              
3Institute for Quantum Physics, University of Hamburg, ou_persistent22              
4The Hamburg Centre for Ultrafast Imaging, ou_persistent22              
5Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938285              

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 Abstract: We study cavity-mediated interactions that are generated in a two-dimensional two-band Hubbard model coupled to an optical cavity, when it is driven in-gap by a strong laser. Starting from a Floquet description of the driven system, we derive effective low-energy Hamiltonians by projecting out the high-energy degrees of freedom and treating intrinsic interactions on a mean-field level. We then investigate how the emergence of high-energy Frenkel excitons from the electronic interband coupling, which form near the upper electronic band, affects the interactions as well as the laser-induced Floquet renormalization of the electronic band structure. Cavity-mediated interactions are enhanced strongly when the light couples to an excitonic transition. Additionally, the interaction as well as the Floquet renormalization are strongly broadened in reciprocal space, which could further boost the impact of cavity-mediated interactions on the driven-dissipative steady state.

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Language(s): eng - English
 Dates: 2024-02-262023-10-232024-02-272024-03-182024-03-15
 Publication Status: Issued
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 Rev. Type: Peer
 Identifiers: arXiv: 2310.12626
DOI: 10.1103/PhysRevB.109.115137
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Project name : X.W. thanks Jiajun Li for inspiring discussions. The authors acknowledge support from the Cluster of Excellence “Advanced Imaging of Matter” of the Deutsche Forschungsgemeinschaft (DFG)-EXC 2056-Project ID No. 390715994. Open access publication funded by the Max Planck Society.
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 109 (11) Sequence Number: 115137 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008