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We theoretically investigate dynamic structure factors of a stronglyinteracting Fermi superfluid near an orbital Feshbach resonance with randomphase approximation, and find their dynamical characters during the phasetransition between a balanced conventional Bardeen-Cooper-Schrieffer superfluidand a polarized Sarma superfluid by continuously varying the chemical potentialdifference of two spin components. In a BEC-like regime of the BCS superfluid,dynamic structure factors can do help to distinguish the in-phase ground statefrom the out-of-phase metastable state by the relative location of molecularexcitation and Leggett mode, or the minimum energy to break a Cooper pair. Inthe phase transition between BCS and Sarma superfluid, we find the dynamicstructure factor of Sarma superfluid has its own specific gapless excitation ata small transferred momentum which is mixed with the collective phononexcitation, and also a relatively strong atomic excitation at a largetransferred momentum because of the existence of unpaired Fermi atoms, thesesignals can be used to differentiate Sarma superfluid from BCS superfluid.

physical review. a/physical review, a

Dynamic structure factors of a strongly interacting Fermi superfluid  near an orbital Feshbach resonance across the phase transition from BCS to  Sarma superfluid