We report a formation of sharp, solitonlike structures in an experimentally accessible ultracold Fermi gas, as a quantum carpet solution is analyzed in a many-body 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. As they disappear, the system enters a dynamical equilibrium, in which kinetic energies of atoms tend to the same average value.

• Received 19 November 2018
• Revised 24 April 2019
• Accepted 9 December 2019

DOI:https://doi.org/10.1103/PhysRevResearch.2.013119

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Published by the American Physical Society