Mean-field study of itinerant ferromagnetism in trapped ultracold Fermi gases: Beyond the local density approximation
arXiv:1004.5443 · doi:10.1103/PhysRevA.82.013627
Abstract
We theoretically investigate the itinerant ferromagnetic transition of a spherically trapped ultracold Fermi gas with spin imbalance under strongly repulsive interatomic interactions. Our study is based on a self-consistent solution of the Hartree-Fock mean-field equations beyond the widely used local density approximation. We demonstrate that, while the local density approximation holds in the paramagnetic phase, after the ferromagnetic transition it leads to a quantitative discrepancy in various thermodynamic quantities even with large atom numbers. We determine the position of the phase transition by monitoring the shape change of the free energy curve with increasing the polarization at various interaction strengths.
arXiv comment7 pages, 5 figures; published version in Phys. Rev. A
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- Itinerant magnetism in Weyl spin-orbit coupled Fermi gas