Detecting $\pi$-phase superfluids with $p$-wave symmetry in a quasi-1D optical lattice

Abstract

We propose an experimental protocol to study $p$-wave superfluidity in a spin-polarized cold Fermi gas tuned by an $s$-wave Feshbach resonance. A crucial ingredient is to add a quasi-1D optical lattice and tune the fillings of two spins to the $s$ and $p$ band, respectively. The pairing order parameter is confirmed to inherit $p$-wave symmetry in its center-of-mass motion. We find that it can further develop into a state of unexpected $\pi$-phase modulation in a broad parameter regime. Measurable quantities are calculated, including time-of-flight distributions, radio-frequency spectra, and in situ phase-contrast imaging in an external trap. The $\pi$-phase $p$-wave superfluid is reminiscent of the $\pi$-state in superconductor-ferromagnet heterostructures but differs in symmetry and origin. If observed, it would represent another example of $p$-wave pairing, first discovered in He-3 liquids.

5 pages, 5 figures

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Cited by in corpus (7)

• Quantum criticality and universality in the $p$-wave paired Aubry-André-Harper model
• Quantum Coherent States of Interacting Bose-Fermi Mixtures in One Dimension
• Chiral orbital magnetism of $p$-orbital bosons in optical lattices
• Cavity-induced Fulde-Ferrell-Larkin-Ovchinnikov superfluids of ultracold Fermi gases
• Implementing Majorana fermions in a cold-atom honeycomb lattice with textured pairings
• Fulde-Ferrell superfluids in spinless ultracold Fermi gases
• Emergent interlayer nodal superfluidity of a dipolar fermi gas in bilayer optical lattices