Probing the Interface of a Phase-Separated State in a Repulsive Bose-Fermi Mixture. (arXiv:1802.01954v1 [quant-ph])

We probe the interface between a phase-separated Bose-Fermi mixture
consisting of a small BEC of $^{41}$K residing in a large Fermi sea of $^6$Li.
We quantify the residual spatial overlap between the two components by
measuring three-body recombination losses for variable strength of the
interspecies repulsion. A comparison with a numerical mean-field model
highlights the importance of the kinetic energy term for the condensed bosons
in maintaining the thin interface far into the phase-separated regime. Our
results demonstrate a corresponding smoothing of the phase transition in a
system of finite size.

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