Quantum degenerate Bose-Fermi mixture of chemically different atomic species with widely tunable interactions
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Zwierlein-2012-Quantum degenerate Bose-Fermi mixture of.pdf
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Author(s)
Park, Jee Woo
Wu, Cheng-Hsun
Santiago, Ibon
Tiecke, Tobias G.
Will, Sebastian
Ahmadi, Peyman
Zwierlein, Martin Wolfram
Date Issued
May 2012
Journal
Physical Review A
Publisher
American Physical Society
Citation
Park, Jee Woo et al. “Quantum Degenerate Bose-Fermi Mixture of Chemically Different Atomic Species with Widely Tunable Interactions.” Physical Review A 85.5 (2012). ©2012 American Physical Society
Version
Final published version
Abstract
We have created a quantum degenerate Bose-Fermi mixture of [superscript 23]Na and [superscript 40]K with widely tunable interactions via broad interspecies Feshbach resonances. Over 30 Feshbach resonances between [superscript 23]Na and [superscript 40]K were identified, including p-wave multiplet resonances. The large and negative triplet background scattering length between [superscript 23]Na and [superscript 40]K causes a sharp enhancement of the fermion density in the presence of a Bose condensate. As explained via the asymptotic bound-state model, this strong background scattering leads to wide Feshbach resonances observed at low magnetic fields. Our work opens up the prospect to create chemically stable, fermionic ground-state molecules of [superscript 23]Na-[superscript 40]K, where strong, long-range dipolar interactions would set the dominant energy scale.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Research Laboratory of Electronics
MIT-Harvard Center for Ultracold Atoms
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.85.051602
