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Cavity quantum-electrodynamical polaritonically enhanced electron-phonon coupling and its influence on
M A Sentef1, M Ruggenthaler1, A Rubio1,2
1Max Planck Institute for the Structure and Dynamics of Matter, Center for Free Electron Laser Science, 22761 Hamburg, Germany.
Science Advances
|December 6, 2018
Summary
Quantum cavities can engineer light-matter interactions in solids. This study shows cavity-enhanced electron-phonon couplings are possible, but superconductivity is not improved for forward-scattering mechanisms.
Area of Science:
- Quantum optics
- Condensed matter physics
- Materials science
Background:
- Traditional laser control of solids relies on classical nonlinear light-matter coupling.
- Quantum electrodynamics offers a new framework for light-matter interactions in quantum materials.
Purpose of the Study:
- To investigate the quantum-electrodynamical coupling of low-dimensional quantum materials to quantized electromagnetic fields in quantum cavities.
- To analyze the impact of phonon polaritons on effective couplings and superconductivity in a FeSe/SrTiO3 model system.
Main Methods:
- Utilizing a quantum-electrodynamical setting to model the interaction.
- Employing Migdal-Eliashberg simulations to study superconducting properties.
- Analyzing electron-phonon coupling modifications due to phonon polaritons.
Main Results:
- Cavity-enhanced electron-phonon couplings were achieved through highly polarizable dipolar phonons.
- Superconductivity was not enhanced for the forward-scattering pairing mechanism.
- The interplay between coupling enhancement and mode softening limited superconductivity improvement.
Conclusions:
- Quantum cavities offer a novel approach to engineer fundamental couplings in solids.
- This research opens avenues for unprecedented control over material properties using quantum phenomena.
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