P-wave interactions in a spin-polarized Fermi gas with and without confinement*

Spin-polarized Fermi gases can only interact with exchange anti-symmetric pair wave functions. The resulting p-wave interactions are less well studied than the s-wave case. We improve our understanding and measure Feshbach resonance-enhanced p-wave interactions in fermionic Potassium (40K) with and without low-dimensional confinement. We first parameterize the three-dimensional (3D) resonance through a combination of coupled-channels calculations, a two-channel model, and dimer binding energies measured through resonant and spin-flip association. This benchmarks 3D interactions, which underlie lower-dimensional scattering. We attain confinement by loading atoms into two orthogonal standing waves to produce an ensemble of quasi-one-dimensional (q1D) tubes. We measure correlation strength through a connection between the power-law tail of radio-frequency transfer spectra and the 1D p-wave contact. Tuning of the magnetic field from the 3D resonance shows not only a confinement-induced resonance shift, but also additional features in a broader regime that arise due to collisions in transverse excited bands. Our studies build a foundation for further exploration of few- and many- body states in spin-polarized Fermi gases.