Emergent s-wave interactions in orbitally active quasi-two-dimensional Fermi gases
Year: 2024
Authors: Dale C.J., Xie K.G.S., Grehan K.P., Zhang S.Z., Maki J., Thywissen J.H.
Autors Affiliation: Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada; Univ Toronto, CQIQC, Toronto, ON M5S 1A7, Canada; Univ Hong Kong, Dept Phys, Hong Kong, Peoples R China; Univ Hong Kong, Hong Kong Inst Quantum Sci & Technol, Hong Kong, Peoples R China; Univ Trento, Pitaevskii BEC Ctr, CNR INO, I-38123 Trento, Italy; Univ Trento, Dipartmento Fis, I-38123 Trento, Italy.
Abstract: 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.
Journal/Review: PHYSICAL REVIEW A
Volume: 110 (5) Pages from: L051302-1 to: L051302-6
More Information: We acknowledge K. Jackson for discussion and early contributions to this work. This research wassupported by AFOSR Grant No. FA9550-19-1-7044, AFOSR Grant No. FA9550-19-1-0365, and NSERC. S.Z. was sup-ported by HK GRF Grants No. 17306024 and No. 17313122, CRF Grants No. C6009-20G and No. C7012-21G, and a RGC Fellowship Award No. HKU RFS2223-7S03.DOI: 10.1103/PhysRevA.110.L051302Citations: 1data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2025-01-12References taken from IsiWeb of Knowledge: (subscribers only)