Zero-Temperature Equation of State and Phase Diagram of Repulsive Fermionic Mixtures

Abstract

We compute the zero-temperature equation of state of a mixture of two fermionic atomic species with repulsive interspecies interactions using second-order perturbation theory. We vary the interaction strength, the population and the mass imbalance, and we analyze the competition between different states: homogeneous, partially separated and fully separated. The canonical phase diagrams are determined for various mass ratios, including the experimentally relevant case of the 6Li-40K mixture. We find substantial differences with respect to the equal-mass case: phase separation occurs at weaker interaction strength, and the partially-separated state can be stable even in the limit of a large majority of heavy atoms. We highlight the effects due to correlations by making comparison with previous mean-field results.

7 pages, 4 figures

References in corpus (6)

• Theory of ultracold Fermi gases
• Computational complexity and fundamental limitations to fermionic quantum Monte Carlo simulations
• Itinerant Ferromagnetism in a Fermi Gas of Ultracold Atoms
• Quantum Monte Carlo Study of a Resonant Bose-Fermi Mixture
• Phase Separation in Mixtures of Repulsive Fermi Gases Driven by Mass Difference
• Coupled Ferromagnetic and Nematic Ordering of Fermions in an Optical Flux Lattice

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• Quantum Monte Carlo study of the role of p-wave interactions in ultracold repulsive Fermi gases
• Ground state energy of the polarized diluted gas of interacting spin $1/2$ fermions
• Itinerant ferromagnetism in the repulsive Hubbard chain with anisotropic odd-wave attraction
• Mechanical stability of resonant Bose-Fermi mixtures
• Energy of strongly attractive Bose-Fermi mixtures
• Multicomponent Fermi systems at low densities