Phase diagram and deformed phase separation for a trapped Fermi gas with population imbalance and BCS pairing interaction |
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Authors: | Z-J Ying M Cuoco C Noce and H-Q Zhou |
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Institution: | (1) Department of Physics and Astronomy and Rice Quantum Institute, Rice University, Houston, TX 77005, USA; |
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Abstract: | We study the phase separated state of an ultracold atomic Fermi
gas confined in a three-dimensional quantum harmonic trap with a
BCS pairing interaction. Examining various finite-temperature
phase diagrams, we investigate the interplay between the filling
of the quantum trap energy levels and the pairing energy. We find
that a low (high) filling leads to a large (small) critical
population imbalance for the superfluid/normal transition,
together with a fully (partially) polarized normal part. We also
show that the decrease of the density leads to a changeover of the
shape of the superfluid core from an equipotential form to a
deformed one. Moreover, we clarify the intrinsic mechanisms that
lead to the deformation, providing a unified scenario for phase
separation and deformation in a trapped Fermi gas, allowing for a
possible interpretation of the apparently controversial
experimental findings. |
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Keywords: | |
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