Ferromagnetic transition of a two-component Fermi gas of Hard Spheres

Abstract

We use microscopic many-body theory to analyze the problem of itinerant ferromagnetism in a repulsive atomic Fermi gas of Hard Spheres. Using simple arguments, we show that the available theoretical predictions for the onset of the ferromagnetic transition predict a transition point at a density ($k_{F}a\sim 1$) that is too large to be compatible with the universal low-density expansion of the energy. We present new variational calculations for the hard-sphere Fermi gas, in the framework of Fermi hypperneted chain theory, that shift the transition to higher densities ($k_{F}a\sim 1.8$). Backflow correlations, which are mainly active in the unpolarized system, are essential for this shift.

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• Zero-Temperature Equation of State and Phase Diagram of Repulsive Fermionic Mixtures
• Quantum Monte Carlo simulations of two-dimensional repulsive Fermi gases with population imbalance
• Two-dimensional Mixture of Dipolar Fermions: Equation of State and Magnetic Phases
• Itinerant ferromagnetism in dilute SU(N) Fermi gases
• Finite range and upper branch effects on itinerant ferromagnetism in repulsive Fermi gases: Bethe-Goldstone ladder resummation approach
• Quantum Monte Carlo study of the role of p-wave interactions in ultracold repulsive Fermi gases
• Ferromagnetism in a Repulsive Atomic Fermi Gas with Correlated Disorder
• Effective interaction approach to the Fermi hard-sphere system
• Spin transport between polarized Fermi gases near the ferromagnetic phase transition
• Beyond universality in repulsive SU(N) Fermi gases
• A coordinated wavefunction for the ground state of liquid helium-4
• Itinerant ferromagnetism of a dipolar Fermi gas with Raman-induced spin-orbit coupling
• The hard-sphere model of strongly interacting fermion systems