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  Cavity quantum-electrodynamical polaritonically enhanced electron-phonon coupling and its influence on superconductivity

Sentef, M. A., Ruggenthaler, M., & Rubio, A. (2018). Cavity quantum-electrodynamical polaritonically enhanced electron-phonon coupling and its influence on superconductivity. Science Advances, 4(11): eaau6969. doi:10.1126/sciadv.aau6969.

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Datensatz-Permalink: https://hdl.handle.net/21.11116/0000-0001-B282-2 Versions-Permalink: https://hdl.handle.net/21.11116/0000-0003-A079-0
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 Urheber:
Sentef, M. A.1, 2, Autor           
Ruggenthaler, M.1, 3, Autor           
Rubio, A.1, 3, 4, Autor           
Affiliations:
1Center for Free Electron Laser Science, ou_persistent22              
2Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_3012828              
3Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
4Center for Computational Quantum Physics (CCQ), The Flatiron Institute, ou_persistent22              

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 Zusammenfassung: So far, laser control of solids has been mainly discussed in the context of strong classical nonlinear light-matter coupling in a pump-probe framework. Here, we propose a quantum-electrodynamical setting to address the coupling of a low-dimensional quantum material to quantized electromagnetic fields in quantum cavities. Using a protoypical model system describing FeSe/SrTiO3 with electron-phonon long-range forward scattering, we study how the formation of phonon polaritons at the two-dimensional interface of the material modifies effective couplings and superconducting properties in a Migdal-Eliashberg simulation. We find that through highly polarizable dipolar phonons, large cavity-enhanced electron-phonon couplings are possible, but superconductivity is not enhanced for the forward-scattering pairing mechanism due to the interplay between coupling enhancement and mode softening. Our results demonstrate that quantum cavities enable the engineering of fundamental couplings in solids, paving the way for unprecedented control of material properties.

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Sprache(n): eng - English
 Datum: 2018-07-062018-10-302018-11-302018-11-30
 Publikationsstatus: Erschienen
 Seiten: 25
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: arXiv: 1802.09437
DOI: 10.1126/sciadv.aau6969
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Projektname : Discussions with H. Appel, S. Johnston, S. Latini, A. J. Millis, and L. Rademaker are gratefully acknowledged. Funding: M.A.S. acknowledges financial support from the DFG through the Emmy Noether Programme (SE 2558/2-1). A.R. acknowledges financial support from the European Research Council (ERC-2015-AdG-694097), Grupos Consolidados (IT578-13), and the European Union’s H2020 program under GA no. 676580 (NOMAD). Author contributions: M.A.S. performed the calculations. M.A.S. and M.R. developed the model, with critical feedback from A.R. The idea of cavity-enhanced electron- phonon coupling was conceived by all authors while developing the implications of cavity QED density functional theory to materials. All authors discussed the results and wrote the manuscript. Competing interests: The authors declare that they have no competing interests. Data and materials availability: All data needed to evaluate the conclusions in the paper are present in the paper and/or the Supplementary Materials. All data generated and analyzed during this study are available from the corresponding author upon reasonable request.
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Quelle 1

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Titel: Science Advances
  Andere : Sci. Adv.
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Washington : AAAS
Seiten: - Band / Heft: 4 (11) Artikelnummer: eaau6969 Start- / Endseite: - Identifikator: ISSN: 2375-2548
CoNE: https://pure.mpg.de/cone/journals/resource/2375-2548