Seminarium Optyczne

We report a formation of sharp, solitonlike structures in an experimentally accessible ultracold gas, as a quantum carpet solution is analyzed in a many body fermionic system. The effect is perfectly coherent in a noninteracting gas, but in the presence of repulsive interaction in a two-component system, the structures vanish at a finite time. The coherence is however revived in a strong interaction regime, with the onset of ferromagnetic phase transition, and with a double quantum carpet appearing.