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Swallowtails of the Superfluid Fermi Gas in an Optical Lattice | | Gentaro Watanabe
; Sukjin Yoon
; Franco Dalfovo
; | | Date: |
30 Jul 2011 | | Abstract: | We investigate the energy band structure of the superfluid flow of ultracold
dilute Fermi gases in an one-dimensional optical lattice along the BCS to BEC
crossover within a mean-field approach. In each side of the crossover region, a
loop structure (swallowtail) appears in the Bloch energy band of the superfluid
above a critical value of the interaction strength. The width of the
swallowtail is largest near unitarity. Across the critical value of interaction
strength, the profiles of density and pairing field change more drastically in
the BCS side than in the BEC side. It is found that along with the appearance
of the swallowtail, there exists a narrow band in the quasiparticle energy
spectrum close to the chemical potential and the incompressibility of the Fermi
gas consequently experiences a profound dip in the BCS side, unlike in the BEC
side. | | Source: | arXiv, 1108.0042 | | Services: | Forum | Review | PDF | Favorites | |
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