Itinerant ferromagnetism in an atomic Fermi gas: Influence of population imbalance

Abstract

We investigate ferromagnetic ordering in an itinerant ultracold atomic Fermi gas with repulsive interactions and population imbalance. In a spatially uniform system, we show that at zero temperature the transition to the itinerant magnetic phase transforms from first to second order with increasing population imbalance. Drawing on these results, we elucidate the phases present in a trapped geometry, finding three characteristic types of behavior with changing population imbalance. Finally, we outline the potential experimental implications of the findings.

arXiv comment10 pages, 4 figures, typos added, references added

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• Competition between pairing and ferromagnetic instabilities in ultracold Fermi gases near Feshbach resonances
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• Quantum order-by-disorder near criticality and the secret of partial order in MnSi
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• On the Stability of the Repulsive Fermi Gas with Contact Interactions
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• Theory of quantum paraelectrics and the metaelectric transition
• Phase-separated Ferromagnetism in Spin-imbalanced Fermi Atoms Loaded on an Optical Ladder: a DMRG study
• Density, spin, and pairing instabilities in polarized ultracold Fermi gases
• Itinerant ferromagnetism with finite ranged interactions
• Quantum Monte Carlo simulations of two-dimensional repulsive Fermi gases with population imbalance
• Dynamical instability of a spin spiral in an interacting Fermi gas as a probe of the Stoner transition
• Polarization of a quasi two-dimensional repulsive Fermi gas with Rashba spin-orbit coupling: a variational study
• Finite range and upper branch effects on itinerant ferromagnetism in repulsive Fermi gases: Bethe-Goldstone ladder resummation approach
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• Interaction energy and itinerant ferromagnetism in a strongly interacting Fermi gas in the absence of molecule formation
• High-fidelity pseudopotentials for the contact interaction
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• Fluctuation-induced pair density wave in itinerant ferromagnets
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• Quantum Monte Carlo study of the two-dimensional ferromagnet
• Itinerant Ferromagnetism in SU(N)-Symmetric Fermi Gases at Finite Temperature: First Order Phase Transitions and Time-Reversal Symmetry
• Beyond universality in repulsive SU(N) Fermi gases
• Spin transport between polarized Fermi gases near the ferromagnetic phase transition
• Spontaneous separation of two-component Fermi gases in a double-well trap
• One-dimensional two-component fermions with contact even-wave repulsion and SU(2) breaking near-resonant odd-wave attraction
• Non-Galilean response of Rashba coupled Fermi gases
• Dynamical spin properties of confined Fermi and Bose systems in presence of spin-orbit coupling
• Contact potential instability in the path-integral description of itinerant ferromagnetism