Polarized Fermi condensates with unequal masses: Tuning the tricritical point

Abstract

We consider a two-component atomic Fermi gas within a mean-field, single-channel model, where both the mass and population of each component are unequal. We show that the tricritical point at zero temperature evolves smoothly from the BEC- to BCS-side of the resonance as a function of mass ratio r. We find that the interior gap state proposed by Liu and Wilczek is always unstable to phase separation, while the breached pair state with one Fermi surface for the excess fermions exhibits differences in its DoSs and pair correlation functions depending on which side of the resonance it lies. Finally, we show that, when r > 3.95, the finite temperature phase diagram of trapped gases at unitarity becomes topologically distinct from the equal mass system.

5 pages, 5 figures

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Cited by in corpus (29)

• Theory of ultracold Fermi gases
• Ultra-cold Polarized Fermi Gases
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• BEC-BCS Crossover of a Trapped Two-Component Fermi Gas with Unequal Masses
• Phase structure of mass- and spin-imbalanced unitary Fermi gases
• Quantum phase diagram of fermion mixtures with population imbalance in one-dimensional optical lattices
• Superfluid pairing between fermions with unequal masses
• Fermi-Fermi Mixtures in the Strong Attraction Limit
• Asymmetric Fermi superfluid with different atomic species in a harmonic trap
• Chandrasekhar-Clogston limit and phase separation in Fermi mixtures at Unitarity
• Small mass- and trap-imbalanced two-component Fermi systems
• Beyond-mean-field description of a trapped unitary Fermi gas with mass and population imbalance
• Quantum phases of Fermi-Fermi mixtures in optical lattices
• Lifetime of Feshbach dimers in a Fermi-Fermi mixture of ${}^6$Li and ${}^{40}$K
• Hetero pairing and component-dependent pseudogap phenomena in an ultracold Fermi gas with mass imbalance
• Sarma phase in relativistic and non-relativistic systems
• Quartet Superfluid in Two-dimensional Mass-imbalanced Fermi Mixtures
• Quantum Lifshitz points and fluctuation-induced first-order phase transitions in imbalanced Fermi mixtures
• Trap-imbalanced fermion mixtures
• Formation of Cooper pairs between conduction and localized electrons in heavy-fermion superconductors
• Temperature Effects in a Fermi Gas with Population Imbalance
• Vortex core states in superfluid Fermi-Fermi mixtures with unequal masses
• Unconventional interaction between vortices in a polarized Fermi gas
• Spin-imbalanced ultracold Fermi gases in a two-dimensional array of tubes
• Ground State Properties of an Asymmetric Hubbard Model for Unbalanced Ultracold Fermionic Quantum Gases
• Phase diagram of asymmetric Fermi gas across Feshbach resonance
• Unitary Fermi gas in the epsilon expansion
• Dipole-Mode Spectrum and Hydrodynamic Crossover in a Resonantly Interacting Two-Species Fermion Mixture
• Connection between the semiconductor--superconductor transition and the spin-polarized superconducting phase in the honeycomb lattice