Cavity quantum-electrodynamical polaritonically enhanced superconductivity

Science Advances 4 (11), eaau6969 (2018)

Cavity quantum-electrodynamical polaritonically enhanced superconductivity

M. A. Sentef,M. Ruggenthaler, A. Rubio

Laser control of solids has so far mainly been 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 nanocavities. Using a protoypical model system describing FeSe/SrTiO3, we study how the formation of phonon polaritons at the 2D interface of the material modifies its superconducting properties in a Migdal-Eliashberg simulation. We find that through highly polarizable dipolar phonons, cavity-induced superconductivity is possible at temperatures above the bare critical temperature of the system. 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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http://dx.doi.org/10.1126/sciadv.aau6969
arxiv
http://arxiv.org/abs/1802.09437
Notes
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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