presence of attractive interactions. Based on the functional Keldysh theory beyond the mean-
field treatment, we find that the system shows a time-periodic bosonic condensation and
reaches an intrinsic dissipative Floquet superconducting (SC) phase. Due to the interplay
between dissipations and periodic modulations, the Floquet SC gap becomes “soft” and
contains the diffusive fermionic modes with finite lifetimes. However, bosonic modes of the …