Journal
PHYSICAL REVIEW B
Volume 77, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.77.174431
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We study Fermi gases in a three-dimensional cubic optical lattice with five fermions per site, i.e., the s band is completely filled and the p band with threefold degeneracy is half filled. We show that for repulsive interaction between fermions, the system will exhibit spin-3/2 antiferromagnetic order at low temperature. This conclusion is obtained both in strong interaction regime by strong coupling expansion and in weak interaction regime by the Hartree-Fock mean-field theory with analysis of the Fermi surface nesting. We also show that in the strongly correlated regime the Neel temperature for p band antiferromagnetism is 2 to 3 orders of magnitudes higher than that of s band, which is much more promising to be attained in cold atom experiments.
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