Stimulated electron-electron interaction in cavities

Electron interactions mediated by the exchange of virtual bosonic excitations form a central cornerstone in quantum many-body theory where they are responsible for many-body phases such as superconductivity [1,2]. More recently, interactions mediated by excitations with photonic character, such as exciton-polaritons [3,4] and transverse cavity photons [5] have also been tipped to lead to superconductivity. We propose a novel scheme to engineer stimulated electron interactions in any 2D electron system coupled to a cavity under driving. The interaction can be tuned to be attractive (or repulsive) and lead to Cooper instability at temperature up to ~1K. Our scheme opens up a new avenue for on-demand quantum material engineering.

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[5] F. Schlawin, A. Cavalleri, D. Jaksch, Phys. Rev. Lett. 122, 133602 (2019)