Zeroth Sound Modes of Dilute Fermi Gas with Arbitrary Spin
S-K. Yip, Tin-Lun, Ho
Abstract
Motivated by the recent success of optical trapping of alkali bosons, we have studied the zeroth sound modes of dilute Fermi gases with arbitrary spin-f, which are spin-S excitations (0≤ S≤ 2f). The dispersion of the mode (S) depends on a single Landau parameter F(S), which is related to the scattering lengths of the system through a simple formula. Measurement of (even a subset of) these modes in finite magnetic fields will enable one to determine all the interaction parameters of the system.
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