Stability of a Fully Magnetized Ferromagnetic state in Repulsively Interacting Ultracold Fermi Gases

Details Stability of a Fully Magnetized Ferromagnetic state in Repulsively Interacting Ultracold Fermi Gases Stability of a Fully Magnetized Ferromagnetic state in Repulsively Interacting Ultracold Fermi Gases

2010-01-28

arxiv.org/abs/1001.5139v2

Physical Review A, Rapid Communication, 81, 041602 (2010)

Physics

Condensed Matter

Quantum Gases

4 pages, 3 figures

Scientific paper

10.1103/PhysRevA.81.041602

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.

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