Soliton in BCS superfluid Fermi gas
  We analyze a superfluid state of two species gas of fermions trapped in a quasi-1D harmonic potential and interacting via attractive s-wave collisions. It is shown that the gap equation posesses a self consistent solution with an antisymmetric gap function. The gap function has a localized soliton or kink in the center of the trap. 
Jacek Dziarmaga and Krzysztof Sacha