p-wave stabilization of three-dimensional Bose-Fermi solitons

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  2. Dr Nicholas Parker
Author(s)Parker NG, Smith DA
Publication type Article
JournalPhysical Review A
Year2012
Volume85
Issue1
Pages
ISSN (print)0556-2791
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We explore bright soliton solutions of ultracold Bose-Fermi gases, showing that the presence of p-wave interactions can remove the usual collapse instability and support stable soliton solutions that are global energy minima. A variational model that incorporates the relevant s- and p-wave interactions in the system is established analytically and solved to probe the dependencies of the soliton stationary states on key experimental parameters. Under attractive s-wave interactions, bright solitons exist only as metastable states susceptible to collapse. Remarkably, the presence of repulsive p-wave interactions alleviates this collapse instability. This dramatically widens the range of experimentally achievable soliton solutions and indicates greatly enhanced robustness. While we focus specifically on the boson-fermion pairing of 87Rb and 40K, the stabilization inferred by repulsive p-wave interactions should apply to the wider remit of ultracold Bose-Fermi mixtures.
PublisherAmerican Physical Society
URLhttp://link.aps.org/doi/10.1103/PhysRevA.85.013604
DOI10.1103/PhysRevA.85.013604
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