Itinerant Ferromagnetism in ultracold Fermi gases

Abstract

Itinerant ferromagnetism in cold Fermi gases with repulsive interactions is studied applying the Jastrow-Slater approximation generalized to finite polarization and temperature. For two components at zero temperature a second order transition is found at $a{k}_F\simeq 0.90$ compatible with QMC. Thermodynamic functions and observables such as the compressibility and spin susceptibility and the resulting fluctuations in number and spin are calculated. For trapped gases the resulting cloud radii and kinetic energies are calculated and compared to recent experiments. Spin polarized systems are recommended for effective separation of large ferromagnetic domains. Collective modes are predicted and tri-critical points are calculated for multi-component systems.

8 pages, 6 figures

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Cited by in corpus (17)

• Polarons, Dressed Molecules, and Itinerant Ferromagnetism in ultracold Fermi gases
• Correlations and Pair Formation in a Repulsively Interacting Fermi Gas
• Itinerant Ferromagnetism in a polarized two-component Fermi gas
• Nonperturbative Effects on the Ferromagnetic Transition in Repulsive Fermi Gases
• The Nature and Properties of a Repulsive Fermi Gas in the "Upper Branch"
• Theory of SU(N) Fermi liquid
• Ferromagnetic transition of a two-component Fermi gas of Hard Spheres
• Ultracold few fermionic atoms in needle-shaped double wells: spin chains and resonating spin clusters from microscopic Hamiltonians emulated via antiferromagnetic Heisenberg and t-J models
• Stoner ferromagnetism of a strongly interacting Fermi gas in the quasirepulsive regime
• Colliding clouds of strongly interacting spin-polarized fermions
• Repulsive Fermi polarons with negative effective mass
• Interaction energy and itinerant ferromagnetism in a strongly interacting Fermi gas in the absence of molecule formation
• Finite range and upper branch effects on itinerant ferromagnetism in repulsive Fermi gases: Bethe-Goldstone ladder resummation approach
• Many-body molecule formation at a domain wall in a one-dimensional strongly interacting ultracold Fermi gas
• Inhomogeneous spin diffusion in traps with cold atoms
• Non-Galilean response of Rashba coupled Fermi gases
• Phase Transitions of Repulsive Two-Component Fermi Gases in Two Dimensions