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arXiv · 2511.11798

Floquet Engineering Magnetism and Superconductivity in the Square-Lattice Hubbard Model

Jan-Niklas Herre·Takuya Okugawa·Ammon Fischer·Christoph Karrasch·Dante M. Kennes
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Abstract

We study the interplay of magnetic order and superconductivity in the square-lattice Hubbard model under periodic driving with circularly polarized light. Formulating diagrammatic techniques based on the random-phase approximation in terms of Floquet Green's functions, allows us to analyze fluctuation-driven unconventional pairing for weak-to-moderate interactions. The interplay of repulsive interactions and photo-assisted hopping of electrons gives rise to a rich magnetic phase diagram featuring an antiferromagnetic-to-ferromagnetic transition prior to a Floquet Lifshitz transition. Close to the antiferromagnetic transition, topological $d+id$-wave superconductivity prevails in the phase diagram for a wide range of drive parameters. At intermediate-to-high frequency driving near the Floquet Lifshitz transition, superconducting orders are tuned from spin-singlet $d$-wave to spin-triplet $p$-wave character, providing an effective protocol for Floquet engineering topological superconductivity.

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Jan-Niklas Herre, Takuya Okugawa, Ammon Fischer, Christoph Karrasch, Dante M. Kennes. 2025-11-14. Floquet Engineering Magnetism and Superconductivity in the Square-Lattice Hubbard Model. https://doi.org/10.1103/7cj5-tqys

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