Itinerant ferromagnetism in an atom trap

This is the authors' abstract. We don't add key points for this paper.

We propose an experiment to explore the magnetic phase transitions in interacting fermionic Hubbard systems and describe how to obtain the ferromagnetic phase diagram of itinerant-electron systems from these observations. In addition, signatures of ferromagnetic correlations in the observed ground states are found: for large trap radii (trap radius RT>4, in units of coherence length ξ), ground states are topological in nature---a ``skyrmion'' in two dimension, and a ``hedgehog'' in three dimension.