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  • Letter
  • Open Access

Floquet engineering magnetism and superconductivity in the square-lattice Hubbard model

Jan-Niklas Herre1,*, Takuya Okugawa2,3, Ammon Fischer3, Christoph Karrasch4, and Dante M. Kennes1,3

  • *Contact author: jan.herre@rwth-aachen.de
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Phys. Rev. B 113, L121103 – Published 13 March, 2026

DOI: https://doi.org/10.1103/7cj5-tqys

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 photoassisted 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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Phys. Rev. B 113, L121103– Published 13 March, 2026
  • Received 21 November 2025
  • Revised 27 January 2026
  • Accepted 17 February 2026
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