High phase-space density gas of NaCs Feshbach molecules

verfasst von: Aden Z. Lam, Niccolò Bigagli, Claire Warner, Weijun Yuan, Siwei Zhang, Eberhard Tiemann, Ian Stevenson, Sebastian Will
Abstract: We report on the creation of ultracold gases of bosonic Feshbach molecules of NaCs. The molecules are associated from overlapping gases of Na and Cs using a Feshbach resonance at 864.12(5)G. We characterize the Feshbach resonance using bound-state spectroscopy, in conjunction with a coupled-channel calculation. By varying the temperature and atom numbers of the initial atomic mixtures, we demonstrate the association of NaCs gases over a wide dynamic range of molecule numbers and temperatures, reaching 70 nK for our coldest systems and a phase-space density near 0.1. This is an important stepping stone for the creation of degenerate gases of strongly dipolar NaCs molecules in their absolute ground state.
Organisationseinheit(en): Institut für Quantenoptik
Externe Organisation(en): Columbia University
Typ: Artikel
Journal: Physical Review Research
Band: 4
Anzahl der Seiten: 7
ISSN: 2643-1564
Publikationsdatum: 06.2022
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Allgemeine Physik und Astronomie
Elektronische Version(en): https://doi.org/10.48550/arXiv.2202.03355 (Zugang: Offen)
https://doi.org/10.1103/PhysRevResearch.4.L022019 (Zugang: Offen)

BibTeX

@article{0db6488502854b7997695ca0323a4e3c,
title = "High phase-space density gas of NaCs Feshbach molecules",
abstract = "We report on the creation of ultracold gases of bosonic Feshbach molecules of NaCs. The molecules are associated from overlapping gases of Na and Cs using a Feshbach resonance at 864.12(5)G. We characterize the Feshbach resonance using bound-state spectroscopy, in conjunction with a coupled-channel calculation. By varying the temperature and atom numbers of the initial atomic mixtures, we demonstrate the association of NaCs gases over a wide dynamic range of molecule numbers and temperatures, reaching 70 nK for our coldest systems and a phase-space density near 0.1. This is an important stepping stone for the creation of degenerate gases of strongly dipolar NaCs molecules in their absolute ground state.",
author = "Lam, {Aden Z.} and Niccol{\`o} Bigagli and Claire Warner and Weijun Yuan and Siwei Zhang and Eberhard Tiemann and Ian Stevenson and Sebastian Will",
note = "Funding Information: We thank Tarik Yefsah for fruitful discussions and for helpful comments on the manuscript. We also thank Joseph Lee and Edita Bytyqi for experimental assistance. This work was supported by an NSF CAREER Award (Award No. 1848466), an ONR DURIP Award (Award No. N00014-21-1-2721), and a Lenfest Junior Faculty Development Grant from Columbia University. S.W. acknowledges additional support from the Alfred P. Sloan Foundation. I.S. was supported by the Ernest Kempton Adams Fund. C.W. acknowledges support from the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Chien-Shiung Wu Family Foundation. W. Y. acknowledges support from the Croucher Foundation. ",
year = "2022",
month = jun,
doi = "10.48550/arXiv.2202.03355",
language = "English",
volume = "4",
journal = "Physical Review Research",
issn = "2643-1564",
publisher = "American Physical Society",
number = "2",
}