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

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ID: 101810
2018
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Abstract
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/SrTiO 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.
Reference Key
sentef2018cavityscience Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Sentef, M A;Ruggenthaler, M;Rubio, A;
Journal Science advances
Year 2018
DOI
10.1126/sciadv.aau6969
URL
Keywords
cuprates electron–phonon coupling insulator–metal transition ultrafast optics

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