We report on the production of 39 K matter-wave bright solitons, i.e., 1D matter-waves that propagate without dispersion thanks to attractive interactions. The volume of the soliton is studied as a function of the scattering length through three-body losses, revealing peak densities as high as ~ 5 × 10²⁰ m⁻³. Our solitons, close to the collapse threshold, are strongly bound and will find applications in fundamental physics and atom interferometry.
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Lepoutre et al. (2016) studied this question.
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