Fitting ultracold resonances without a fit
arXiv:2108.04712 · doi:10.1088/1367-2630/ac3442
Abstract
We present a numerical procedure allowing one to extract Feshbach resonance parameters from numerical calculations without relying on approximate fitting procedures. Our approach is based on a simple decomposition of the reactance matrix in terms of poles and residual background contribution, and can be applied to the general situation of inelastic overlapping resonances. A simple lineshape for overlapping inelastic resonances, equivalent to known results in the particular cases of isolated and overlapping elastic features, is also rigorously derived.
arXiv comment16 pages, 5 figures
References in corpus (14)
- Many-Body Physics with Ultracold Gases
- Feshbach Resonances in Ultracold Gases
- Spinor Bose-Einstein condensates
- Inter-isotope determination of ultracold rubidium interactions from three high-precision experiments
- Feshbach resonances in ultracold K(39)
- Universality of the three-body Efimov parameter at narrow Feshbach resonances
- Feshbach resonances in ultracold atomic and molecular collisions: threshold behaviour and suppression of poles in scattering lengths
- Optical tuning of the scattering length of cold alkaline earth atoms
- Anisotropic pseudo-potential for polarized dilute quantum gases
- Pseudopotential model of ultracold atomic collisions in quasi-one- and two-dimensional traps
- Feshbach resonances in the 6Li-40K Fermi-Fermi mixture: Elastic versus inelastic interactions
- Analytical model of overlapping Feshbach resonances
- Characterizing Feshbach resonances in ultracold scattering calculations
- Ultracold collisions of Cs in excited hyperfine and Zeeman states