Scientific Results

Feshbach resonances in potassium Bose-Bose mixtures

Year: 2018

Authors: Tanzi L., Cabrera C.R., Sanz J., Cheiney P., Tomza M., Tarruell L.

Autors Affiliation: Barcelona Inst Sci & Technol, ICFO Inst Ciencies Foton, Castelldefels 08860, Barcelona, Spain; Univ Warsaw, Fac Phys, Pasteura 5, PL-02093 Warsaw, Poland; CNR INO, Via Moruzzi 1, I-56124 Pisa, Italy; Univ Firenze, LENS, I-50019 Sesto Fiorentino, Italy; Univ Firenze, Dipartimento Fis & Astron, I-50019 Sesto Fiorentino, Italy;blue, 34 Rue Croix Fer, F-78105 St Germain En Laye, France

Abstract: We present a detailed study of the scattering properties of ultracold mixtures of bosonic potassium atoms. We locate 20 previously unobserved Feshbach resonances in isotopic K-39-(41) K mixtures. These are assigned to s-wave molecular channels by comparison to an asymptotic bound state model and coupled-channel calculations. Additional Feshbach resonances are studied in spin mixtures of a single potassium isotope, both in K-39 and K-41. In particular, we characterize the parameters of a selected K-39 Feshbach resonance by radio-frequency association of Feshbach molecules. Our results could be exploited to refine the model potentials for potassium scattering. Furthermore, these new Feshbach resonances enlarge the range of experiments possible with degenerate Bose-Bose mixtures.

Journal/Review: PHYSICAL REVIEW A

Volume: 98 (6)      Pages from: 062712  to: 062712

KeyWords: atomic-collisions; cold molecules; edge states; quantum; gas

English