Feshbach resonances in potassium Bose-Bose mixtures

Year: 2018

Authors: Tanzi L., Cabrera CR., 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; IXblue, 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: 62712-1  to: 62712-8

More Information: We thank M. Bosch-Aguilera, V. Lienhard, and J. Sastre for experimental assistance during the construction of the experimental apparatus, C. Chisholm and A. Frolian for a careful reading of the manuscript, and J.C. Cifuentes, C. Dengra, X. Menino, and the corresponding ICFO facilities for technical support. We acknowledge A. Simoni for insightful discussions and for giving us the results of Refs. [32,47] in numerical form. The experimental work was financially supported by Fundacio Privada Cellex, European Union (MagQUPT-631633 and QUIC-641122), Ministerio de Ciencia, Innovacion y Universidades (StrongQSIM FIS2014-59546-P, QuDROP FIS2017-88334-P, and Severo Ochoa SEV-2015-0522), Deutsche Forschungsgemeinschaft (Research Unit FOR2414, Project No. 277974659), and Generalitat de Catalunya (SGR1660 and CERCA program). C.R.C. acknowledges support from the Consejo Nacional de Ciencia y Tecnologia (402242/384738), J.S. from the Ministerio de Ciencia, Innovacion y Universidades (BES-2015-072186), P.C. from the Marie Sklodowska-Curie actions (TOPDOL-657439), M.T. from the National Science Centre Poland (2016/23/B/ST4/03231) and the PL-Grid Infrastructure, and L. Tarruell from the Ministerio de Ciencia, Innovacion y Universidades through the Ramon y Cajal program (RYC-2015-17890).
KeyWords: Atomic-collisions; Cold Molecules; Edge States; Quantum; Gas
DOI: 10.1103/PhysRevA.98.062712

Citations: 36
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