title: Phase separation in mixtures of repulsive Fermi gases driven by mass difference.
abstract: We show that phase separation must occur in a mixture of fermions with repulsive interaction if their mass difference is sufficiently large. This phenomenon is highly dimension dependent. Consequently, the density profiles of phase separated 3D mixtures are very different from those in 1D. Noting that the ferromagnetic transition of a spin-1/2 repulsive Fermi gas is the equal mass limit of the phase separation in mixtures, we show from the Bethe ansatz solution that a ferromagnetic transition will take place in the scattering states when the interaction passes through the strongly repulsive regime and becomes attractive.
authors.affiliation: Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.
authors.forename: Xiaoling
authors.initials: X
authors.lastname: Cui
authors.forename: Tin-Lun
authors.initials: TL
authors.lastname: Ho