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.

arXiv comment7 pages, 4 figures

References in corpus (30)

• Feshbach Resonances in Ultracold Gases
• Theory of ultracold Fermi gases
• Computational complexity and fundamental limitations to fermionic quantum Monte Carlo simulations
• Deterministic Preparation of a Tunable Few-Fermion System
• Metastability and Coherence of Repulsive Polarons in a Strongly Interacting Fermi Mixture
• Itinerant Ferromagnetism in a Fermi Gas of Ultracold Atoms
• Three-body problem in Fermi gases with short-range interparticle interaction
• A Mixture of Bose and Fermi Superfluids
• First order transitions and multicritical points in weak itinerant ferromagnets
• Inhomogeneous phase formation on the border of itinerant ferromagnetism
• Itinerant ferromagnetism of a repulsive atomic Fermi gas: a quantum Monte Carlo study
• Itinerant Ferromagnetism in an Ultracold Atom Fermi Gas
• Competition between pairing and ferromagnetic instabilities in ultracold Fermi gases near Feshbach resonances
• Correlations and Pair Formation in a Repulsively Interacting Fermi Gas
• Repulsive polarons and itinerant ferromagnetism in strongly polarized Fermi gases
• Fermionization of two-component few-fermion systems in a one-dimensional harmonic trap
• Ground-State Ferromagnetic Transition in Strongly Repulsive One-Dimensional Fermi Gases
• Itinerant Ferromagnetism in a polarized two-component Fermi gas
• Quantum Monte Carlo Study of a Resonant Bose-Fermi Mixture
• Ferromagnetic spin correlations in a few-fermion system
• Phase Separation in Mixtures of Repulsive Fermi Gases Driven by Mass Difference
• Compressibility of an Ultracold Fermi Gas with Repulsive Interactions
• Mass imbalance effect in resonant Bose-Fermi mixtures
• Ferromagnetism of a Repulsive Atomic Fermi Gas in an Optical Lattice: a Quantum Monte Carlo Study
• Nonperturbative Effects on the Ferromagnetic Transition in Repulsive Fermi Gases
• Itinerant ferromagnetism in an interacting Fermi gas with mass imbalance
• Mott transition of fermionic mixtures with mass imbalance in optical lattices
• Ferromagnetic transition of a two-component Fermi gas of Hard Spheres
• Magnetic phases of mass- and population-imbalanced ultracold fermionic mixtures in optical lattices
• Coupled Ferromagnetic and Nematic Ordering of Fermions in an Optical Flux Lattice

Cited by in corpus (18)

• One-dimensional mixtures of several ultracold atoms: a review
• Two-flavor mixture of a few fermions of different mass in a one-dimensional harmonic trap
• Few strongly interacting ultracold fermions in one-dimensional traps of different shapes
• Impenetrable Mass-Imbalanced Particles in One-Dimensional Harmonic Traps
• Engineering quantum magnetism in one-dimensional trapped Fermi gases with p-wave interactions
• Quantum Monte Carlo study of mass-imbalanced Hubbard models
• Quantum Monte Carlo simulations of two-dimensional repulsive Fermi gases with population imbalance
• Repulsive Fermi polarons with negative effective mass
• Phase-diagram and dynamics of Rydberg-dressed fermions in two-dimensions
• Intercomponent correlations in attractive one-dimensional mass-imbalanced few-body mixtures
• Polarization of a quasi two-dimensional repulsive Fermi gas with Rashba spin-orbit coupling: a variational study
• 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
• Thermodynamics and structural transition of binary atomic Bose-Fermi mixtures in box or harmonic potentials: A path-integral study
• Itinerant ferromagnetism in the repulsive Hubbard chain with anisotropic odd-wave attraction
• Energy of strongly attractive Bose-Fermi mixtures
• Mechanical stability of resonant Bose-Fermi mixtures
• Multicomponent Fermi systems at low densities