Microscopy of an ultranarrow Feshbach resonance using a laser-based atom collider: A quantum defect theory analysis

• URL: http://arxiv.org/abs/2112.15416v3
• Date: Thu, 4 Aug 2022 21:04:42 GMT
• Title: Microscopy of an ultranarrow Feshbach resonance using a laser-based atom collider: A quantum defect theory analysis
• Authors: Matthew Chilcott, James F. E. Croft, Ryan Thomas, and Niels Kj{\ae}rgaard
• Abstract summary: We study the interplay between a magnetic Feshbach resonance and a shape resonance in cold collisions of ultracold $rm 87Rb$ atoms. By exerting control over a parameter space spanned by both collision energy and magnetic field, the width of a Feshbach resonance can be tuned over several orders of magnitude. By conducting experiments at a collision energy matching the shape resonance and using the shape resonance as a magnifying lens we demonstrate a feature broadening to a magnetic width of 8 G compared to a predicted Feshbach resonance width $ll 0.1$mG.
• Score: 0.18665975431697424
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: We employ a quantum defect theory framework to provide a detailed analysis of the interplay between a magnetic Feshbach resonance and a shape resonance in cold collisions of ultracold $\rm ^{87}Rb$ atoms as captured in recent experiments using a laser-based collider [Phys. Rev. Research 3, 033209 (2021)]. By exerting control over a parameter space spanned by both collision energy and magnetic field, the width of a Feshbach resonance can be tuned over several orders of magnitude. We apply a quantum defect theory specialized for ultracold atomic collisions to fully describe of the experimental observations. While the width of a Feshbach resonance generally increases with collision energy, its coincidence with a shape resonance leads to a significant additional boost. By conducting experiments at a collision energy matching the shape resonance and using the shape resonance as a magnifying lens we demonstrate a feature broadening to a magnetic width of 8 G compared to a predicted Feshbach resonance width $\ll 0.1$~mG.

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