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

Lookup NU author(s): Professor Nick ParkerORCiD

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Abstract

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.

Publication metadata

Author(s): Parker NG, Smith DA

Publication type: Article

Publication status: Published

Journal: Physical Review A

Year: 2012

Volume: 85

Issue: 1

Print publication date: 03/01/2012

Date deposited: 07/03/2012

ISSN (print): 0556-2791

Publisher: American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevA.85.013604

DOI: 10.1103/PhysRevA.85.013604

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