Supercurrent driven transition between BCS and Fulde–Ferrell–Larkin–Ovchinnikov phases and its signature in superconducting diode effect in bilayer superconductors

We predict, using the Ginzburg Landau framework, a supercurrent-driven phase transition between Bardeen-Copper-Schreiffer (BCS) and orbital Fulde-Ferrell-Larkin-Ovchinikov phases in a superconducting bilayer under an inplane magnetic field^[1]. This transition arises from the coupling between the gradient of the average phase and winding of the interlayer phase difference and strongly modifies the critical currents. When the inversion symmetry is broken, this transition produces a distinct signature in the superconducting diode effect.

[1] Uddalok Nag, Jonathan Schirmer, C.-X. Liu, J.K. Jain, unpublished