Itinerant Ferromagnetism in a polarized two-component Fermi gas

Abstract

We analyze when a repulsively interacting two-component Fermi gas becomes thermodynamically unstable against phase separation. We focus on the strongly polarised limit where the free energy of the homogeneous mixture can be calculated accurately in terms of well-defined quasiparticles, the repulsive polarons. Phase diagrams as a function of polarisation, temperature, mass imbalance, and repulsive polaron energy, as well as scattering length and range parameter are provided. We show that the lifetime of the repulsive polaron increases significantly with the interaction range and the mass of the minority atoms, raising the prospects of detecting the transition to the elusive itinerant ferromagnetic state with ultracold atoms.

Published version; 5 pages, 5 figures, plus Supplemental Material

References in corpus (11)

• Theory of ultracold Fermi gases
• Fermi-Polaron: Diagrammatic Monte Carlo for Divergent Sign-Alternating Series
• Itinerant Ferromagnetism in a Fermi Gas of Ultracold Atoms
• Three-boson problem near a narrow Feshbach resonance
• Ultra-cold Polarized Fermi Gases
• Normal state of highly polarized Fermi gases: Full many-body treatment
• Trimers, molecules and polarons in imbalanced atomic Fermi gases
• Quasiparticle properties of an impurity in a Fermi gas
• Phase Separation in Mixtures of Repulsive Fermi Gases Driven by Mass Difference
• Multi-channel scattering and Feshbach resonances: Effective theory, phenomenology, and many-body effects
• Itinerant ferromagnetism with finite ranged interactions

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