We investigate the scattering properties and bound states of a quasi-two-dimensional (Q2D) spin-polarized Fermi gas near a $p$-wave Feshbach resonance. Strong confinement promotes the out-of-plane spatial wave function to an orbital degree of freedom with an energetic gap. Employing radio-frequency (rf) spectroscopy, we observe both power-law scaling and the dimensional-crossover feature that are indicative of an emergent $s$-wave interaction channel. Additionally, we demonstrate the formation of two types of low-energy dimers, possessing either $s$-wave or $p$-wave symmetry, through rf spin-flip association from an orbital mixture. Our observations are compared to predictions from a Q2D scattering model that incorporates exchange-antisymmetric orbital pair wave functions. These findings underscore how gapped orbital degrees of freedom can control scattering symmetry in strongly confined ultracold gases.

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• Cold atoms & matter waves
• Fermi gases
• Scattering of atoms, molecules, clusters & ions
• Ultracold collisions
• 2-dimensional systems
• Feshbach resonance