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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.

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Datensatz-Permalink: https://hdl.handle.net/21.11116/0000-0001-B282-2 Versions-Permalink: https://hdl.handle.net/21.11116/0000-0001-B283-1
Genre: Forschungspapier

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1802.09437.pdf (Preprint), 534KB
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https://hdl.handle.net/21.11116/0000-0001-B284-0
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1802.09437.pdf
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File downloaded from arxiv.org: 2018-07-13
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2018
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https://arxiv.org/abs/1802.09437 (Preprint)
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 Urheber:
Sentef, M. A.1, 2, Autor           
Ruggenthaler, M.1, 2, Autor           
Rubio, A.1, 2, 3, 4, Autor           
Affiliations:
1Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
2Center for Free Electron Laser Science, ou_persistent22              
3Nano-Bio Spectroscopy Group, Universidad del País Vasco, ou_persistent22              
4Center for Computational Quantum Physics (CCQ), The Flatiron Institute, ou_persistent22              

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 Zusammenfassung: Laser control of solids was so far 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 2D 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. An analysis of critical temperature dependencies on couplings and mode frequencies suggests that that cavity-enhanced superconductivity is possible for more conventional short-range pairing mechanisms. Our results demonstrate that quantum cavities enable the engineering of fundamental couplings in solids paving the way to unprecedented control of material properties.

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Sprache(n): eng - English
 Datum: 2018-02-262018-07-02
 Publikationsstatus: Online veröffentlicht
 Seiten: 25
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 Art der Begutachtung: Keine Begutachtung
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Projektname : Discussions with H. Appel, S. Johnston, S. Latini, A. J. Millis, and L. Rademaker are gratefully acknowledged. M.A.S. acknowledges financial support by the DFG through the Emmy Noether programme (SE 2558/2-1). A. R. acknowledges financial support by the European Research Council (ERC-2015-AdG-694097), Grupos Consolidados (IT578-13), and European Union’s H2020 program under GA no. 676580 (NOMAD).
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