Dynamical Control of Superconductivity in Superconductor-Ferromagnet Bilayers

Dimitri Pimenov; Nicholas R. Poniatowski; Charlotte G. L. Bøttcher; Amir Yacoby; Debanjan Chowdhury

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arXiv · 2606.12544

Dynamical Control of Superconductivity in Superconductor-Ferromagnet Bilayers

Dimitri Pimenov·Nicholas R. Poniatowski·Charlotte G. L. Bøttcher·Amir Yacoby·Debanjan Chowdhury

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Abstract

We study a simplified model of a ferromagnetic metal proximitized by a fully-gapped $s-$wave superconductor and integrated with a microwave resonator. The low-energy excitations in the combined system consist of ferromagnetic magnons, Bogoliubov excitations of the superconductor, and cavity photons. We show here that when the magnons and photons have comparable frequencies and are subject to an external drive, the hybridized driven magnon-polaritons induce a non-equilibrium crossover from the expected proximitized nodal $p-$wave superconductor to a fully gapped $(p_x+ip_y)-$superconductor. Moreover, the characteristic crossover temperature is inversely related to the magnon-photon detuning. We compute the temperature-dependent renormalization of the cavity photon frequencies across this nodal to nodeless evolution, which modifies the kinetic inductance of the resonator, and find a number of non-trivial features tied to the non-equilibrium (i.e., driven) nature of the problem. We compare and contrast these results with a recent circuit quantum electrodynamics (cQED) based experiment studying a permalloy-niobium bilayer, where a non-trivial dependence of the low-temperature cavity response on the magnon-photon detuning was observed. Our results pave the way for a principled exploration of engineering novel states of matter by coupling cavity photons to electronic collective modes in correlated two-dimensional materials and interfaces.

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Dimitri Pimenov, Nicholas R. Poniatowski, Charlotte G. L. Bøttcher, Amir Yacoby, Debanjan Chowdhury. 2026-06-10. Dynamical Control of Superconductivity in Superconductor-Ferromagnet Bilayers. https://arxiv.org/abs/2606.12544

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