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  Cavity engineering of Hubbard U via phonon polaritons

Le Dé, B., Eckhardt, C., Kennes, D. M., & Sentef, M. A. (2022). Cavity engineering of Hubbard U via phonon polaritons. Journal of Physics: Materials, 5(2): 024006. doi:10.1088/2515-7639/ac618e.

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Le_Dé_2022_J._Phys._Mater._5_024006.pdf (Publisher version), 5MB
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Le_Dé_2022_J._Phys._Mater._5_024006.pdf
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2022
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© The Author(s). Published by IOP Publishing Ltd

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https://arxiv.org/abs/2201.04128 (Preprint)
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https://doi.org/10.1088/2515-7639/ac618e (Publisher version)
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 Creators:
Le Dé, B.1, 2, Author              
Eckhardt, C.1, 2, 3, Author              
Kennes, D. M.3, 4, Author              
Sentef, M. A.1, 2, Author              
Affiliations:
1Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_3012828              
2Center for Free-Electron Laser Science, ou_persistent22              
3Institut für Theorie der Statistischen Physik, RWTH Aachen University and JARA-Fundamentals of Future Information Technology, ou_persistent22              
4Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              

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Free keywords: polaritons, quantum optics, strongly correlated materials, quantum materials, Floquet engineering
 Abstract: Pump-probe experiments have suggested the possibility to control electronic correlations by driving infrared-active phonons with resonant midinfrared laser pulses. In this work we study two possible microscopic nonlinear electron-phonon interactions behind these observations, namely coupling of the squared lattice displacement either to the electronic density or to the double occupancy. We investigate whether photon-phonon coupling to quantized light in an optical cavity enables similar control over electronic correlations. We first show that inside a dark cavity electronic interactions increase, ruling out the possibility that Tc in superconductors can be enhanced via effectively decreased electron-electron repulsion through nonlinear electron-phonon coupling in a cavity. We further find that upon driving the cavity, electronic interactions decrease. Two different regimes emerge: (i) a strong coupling regime where the phonons show a delayed response at a time proportional to the inverse coupling strength, and (ii) an ultra-strong coupling regime where the response is immediate when driving the phonon polaritons resonantly. We further identify a distinctive feature in the electronic spectral function when electrons couple to phonon polaritons involving an infrared-active phonon mode, namely the splitting of the shake-off band into three bands. This could potentially be observed by angle-resolved photoemission spectroscopy.

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Language(s): eng - English
 Dates: 2022-03-102022-01-112022-03-282022-04-11
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 2201.04128
DOI: 10.1088/2515-7639/ac618e
 Degree: -

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Title: Journal of Physics: Materials
  Other : JPhys Materials
  Abbreviation : J. Phys. Mater.
Source Genre: Journal
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Publ. Info: Bristol : Institute of Physics Publishing
Pages: - Volume / Issue: 5 (2) Sequence Number: 024006 Start / End Page: - Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/2515-7639