Stability of a fully polarized ultracold Fermi gas near zero-crossing of a p-wave Feshbach resonance |
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Authors: | N T Zinner |
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Institution: | (1) Department of Physics Unit 3046, University of Connecticut, 2152 Hillside Road, 06269-3046 Storrs, CT, USA |
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Abstract: | We consider a fully polarized ultracold Fermi gas interacting through a p-wave Feshbach resonance. Using a two-channel model,
we find the effective potential at the point where the p-wave scattering length goes to zero. Here the effective interaction
provides attraction and one can therefore ask about the stability of the system. We calculate the energy density of the system
in the Thomas-Fermi approximation, determine the profile of the gas, and the critical number of particle in the system as
function of the relevant interaction parameters. The instability can be inferred from a simple breathing mode argument which
explains the scaling found numerically. The critical particle number turns out to be extremely large unless the external confinement
is very tight. We therefore conclude that the effect is insignificant for standard trapping potentials and
that the magnetic dipole interaction is the important term at zero scattering length. However, for tight confinement as in
an optical lattice higher-order corrections can become important. |
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