Work

Scattering resonances and pairing in a Rabi-coupled Fermi gas

Year: 2025

Type: article

Abstract: We investigate the possibility of using a Rabi drive to tune the interactions in an atomic Fermi gas. Specifically, we consider the scenario where two fermion species (spins) are Rabi coupled and interacting with a third uncoupled species. Using an exact calculation within a minimal low-energy model, we derive analytical expressions for the effective scattering length and effective range that characterize the collisions between a Rabi-dressed atom and an atom from the third species. In particular, we find that new scattering resonances emerge in the Rabi-coupled system, which we demonstrate are linked to the existence of hybrid two-body bound states. Furthermore, we show via a generalized Thouless criterion that the scattering properties have a direct impact on the superfluid transitions in the Rabi-coupled Fermi gas. The presence of Rabi-induced resonances thus has implications for the investigation of many-body physics with driven atomic gases.

Source: Physical Review A

DOI: 10.1103/stvf-cn1b

Authors: Olivier Bleu, Brendan C. Mulkerin, Cesar R. Cabrera, Jesper Levinsen, Meera M. Parish

Institutions: Monash University, Universität Hamburg, Hamburg Centre for Ultrafast Imaging

Language: English

Topic: Cold Atom Physics and Bose-Einstein Condensates

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: Australian Research Council

Awards: G1105181558, Strongly driven quantum gases, Polarons in flatland, The nature and fate of quasiparticles in correlated quantum matter, ARC Centre of Excellence in Future Low Energy Electronics Technologies