Multipolar Fermi-surface deformation in a Rydberg-dressed Fermi gas with long-range anisotropic interactions

Zhou, Yijia; Nath, Rejish; Wu, Haibin; Lesanovsky, Igor; Li, Weibin

Abstract

We study theoretically the deformation of the Fermi surface (FS) of a three-dimensional gas of Rydberg-dressed 6Li atoms. The laser dressing to high-lying Rydberg D states results in angle-dependent soft-core-shaped interactions whose anisotropy is described by multiple spherical harmonics. We show that this can drastically modify the shape of the FS and that its deformation depends on the interplay between the Fermi momentum kF and the reciprocal momentum ¯k corresponding to the characteristic soft-core radius of the dressing-induced potential. When kF<¯k, the dressed interaction stretches a spherical FS into an ellipsoid. When kF≳¯k, complex deformations are encountered which exhibit multipolar characteristics. We analyze the formation of Cooper pairs around the deformed FS and show that they occupy large orbital angular momentum states (p, f, and h wave) coherently. Our study demonstrates that Rydberg dressing to high angular momentum states may pave a route toward the investigation of unconventional Fermi gases and multiwave superconductivity.

Citation

Zhou, Y., Nath, R., Wu, H., Lesanovsky, I., & Li, W. (2021). Multipolar Fermi-surface deformation in a Rydberg-dressed Fermi gas with long-range anisotropic interactions. Physical Review A, 104(6), Article L061302. https://doi.org/10.1103/physreva.104.l061302

• Journal Article Type: Article
• Acceptance Date: Dec 7, 2021
• Online Publication Date: Dec 20, 2021
• Publication Date: Dec 1, 2021
• Deposit Date: Dec 17, 2021
• Publicly Available Date: Jan 5, 2022
• Journal: Physical Review A
• Print ISSN: 2469-9926
• Electronic ISSN: 2469-9934
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 104
• Issue: 6
• Article Number: L061302
• DOI: https://doi.org/10.1103/physreva.104.l061302
• Public URL: https://nottingham-repository.worktribe.com/output/7024042
• Publisher URL: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.104.L061302
• Additional Information: ©2021 American Physical Society