Reentrant Superfluidity and Pair Density Wave in Single Component Dipolar Fermi Gases

Abstract

We study the superfluidity of single component dipolar Fermi gases in three dimensions within a pairing fluctuation theory. The transition temperature $T_c$ for the dominant $p_z$ wave superfluidity exhibits a remarkable re-entrant behavior as a function of the pairing strength induced by the dipole-dipole interaction (DDI), which leads to an anisotropic pair dispersion. The anisotropy and the long range nature of the DDI cause $T_c$ to vanish for a narrow range of intermediate interaction strengths, where a pair density wave state emerges as the ground state. The superfluid density and thermodynamics below $T_c$, along with the density profiles in a harmonic trap, are investigated as well, throughout the BCS-BEC crossover. Implications for experiments are discussed.

6 pages, 6 color figures; replaced with the final published version

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Cited by in corpus (8)

• When Superconductivity Crosses Over: From BCS to BEC
• Unusual destruction and enhancement of superfluidity of atomic Fermi gases by population imbalance in a one-dimensional optical lattice
• Exotic superfluidity and pairing phenomena in atomic Fermi gases in mixed dimensions
• Strong pairing in two dimensions: Pseudogaps, domes, and other implications
• Ground states of atomic Fermi gases in a two-dimensional optical lattice with and without population imbalance
• Pairing phenomena and superfluidity of atomic Fermi gases in a two-dimensional optical lattice: Unusual effects of lattice-continuum mixing
• Flat band effects on the ground-state BCS-BEC crossover in atomic Fermi gases in a quasi-two-dimensional Lieb lattice
• Leggett mode in a two-component Fermi gas with dipolar interactions