2010/01/31 by Xiaoling Cui, Hui Zhai · 1 citation
Physics and Astronomy · #cond-mat.quant-gas #cond-mat.str-el
paper · pdf · doi:10.1103/physreva.81.041602
published as Physical Review A, Rapid Communication, 81, 041602 (2010) · 4 pages, 3 figures
arxiv created 2010/04/14 · arxiv updated 2010/04/15
We construct a variational wave function to study whether a fully polarized Fermi sea is energetically stable against a single spin flip. Our variational wave function contains sufficient short-range correlation at least to the same level as Gutzwiller's projected wave function. For Hubbard lattice model and continuum model with pure repulsive interaction, we show a fully polarized Fermi sea is generally unstable even when the repulsive strength becomes infinite. While for a resonance model, ferromagnetic state is possible if the s-wave scattering length is positive and sufficiently large, and the system is prepared in scattering state orthogonal to molecular bound state. However, we can not rule out the possibility that more exotic correlation can destabilize the ferromagnetic state.