Abstract:Collective excitation modes in a general spin-3/2 Fermi gas with spin-dependent contact interactions are investigated by two-particle Green's functions and diagram techniques. Energy spectra for two branches of charge-density waves and three branches of transverse spin-density waves are obtained within the random-phase approximation. All spectra are gapless and linear in the small wave vector $q$, with their slopes dependant on the interaction parameters. It is also found that the spin-mixing interaction has e… Show more
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