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Bulletin of the American Physical Society

Towards Creating Fermionic Ground State Molecules of $^{23}$Na$^{40}$K with Strong Dipolar Interactions

Jee Woo Park, Cheng-Hsun Wu, Jennifer M. Schloss, Qingyang Wang, Sebastian Will, Martin W. Zwierlein

Published Jun 4, 2013• 0 citations
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We have created a quantum degenerate Bose-Fermi mixture of ${}^{23}$Na and ${}^{40}$K with widely tunable interactions via broad interspecies Feshbach resonances. Over 30 Feshbach resonances between ${}^{23}$Na and ${}^{40}$K were identified, including $p$-wave multiplet resonances. The large and negative triplet background scattering length between ${}^{23}$Na and ${}^{40}$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 ${}^{23}$Na-${}^{40}$K, where strong, long-range dipolar interactions would set the dominant energy scale.

arXiv:1110.4552•Physical Review A•May 9, 2012•131 citations
Towards Creating Fermionic Ground State Molecules of 23^{23}23Na40^{40}40K with Strong Dipolar Interactions
Creation of Ultracold Dipolar Ground State Molecules of 23^{23}23Na40^{40}40K
We have created a quantum degenerate Bose-Fermi mixture of 23{}^{23}23Na and 40{}^{40}40K with widely tunable interactions via broad interspecies Feshbach resonances. Over 30 Feshbach resonances between 23{}^{23}23Na and 40{}^{40}40K were identified, including ppp-wave multiplet resonances. The large and negative triplet background scattering length between 23{}^{23}23Na and 40{}^{40}40K 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 23{}^{23}23Na-40{}^{40}40K, where strong, long-range dipolar interactions would set the dominant energy scale.