Optical generation of quasisolitons in a single-component gas of neutral   fermionic atoms
  We analyze, the generation of soliton-like solutions in a single-component Fermi gas of neutral atoms at zero and finite temperatures with the phase imprinting method. By using both the numerical and analytical calculations, we find the conditions when the quasisolitons, which apparently resamble the properties of solitons in non-linear integrable equations, do exist in a non-interacting Fermi gas. We present the results for both spatially homogeneous and trapped cases, and emphasize the importance of the Fermi statistics and the absence of the interaction for the existence of such solutions. 
T. Karpiuk, M. Brewczyk, L. Dobrek, M.A. Baranov, M. Lewenstein, and   K. Rzazewski