Global superfluid phase diagram of three component fermions with magnetic ordering
arXiv:1203.6065 · doi:10.1103/PhysRevB.86.064519
Abstract
We investigate a three component fermion mixture in the presence of weak attractive interactions. We use a combination of the equation of motion and the Gaussian variational mean-field approaches, which both allow for simultaneous superfluid and magnetic ordering in an unbiased way, and capture the interplay between the two order parameters. This interplay significantly modifies the phase diagram, especially the superfluid-normal phase boundaries. In the close vicinity of the critical temperature and for small chemical potential imbalances, strong particle-hole symmetry breaking leads to a phase diagram similar to the one predicted by Cherng et al. [Phys. Rev. Lett. 99, 130406 (2007)], however, the overall phase diagram is markedly different: new chemical potential-driven first and second order transitions and triple points emerge as well as more exotic second order multicritical points, and bicritical lines with O(2,2) symmetry. We identify the terms which are necessary to capture this complex phase diagram in a Ginzburg-Landau approach, and determine the corresponding coefficients.
References in corpus (24)
- Many-Body Physics with Ultracold Gases
- Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
- Artificial gauge potentials for neutral atoms
- Synthetic magnetic fields for ultracold neutral atoms
- Vortices and Superfluidity in a Strongly Interacting Fermi Gas
- Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
- Evidence for Superfluidity of Ultracold Fermions in an Optical Lattice
- Collisional stability of a three-component degenerate Fermi gas
- Direct Observation of the Superfluid Phase Transition in Ultracold Fermi Gases
- Phase diagram of a two-component Fermi gas with resonant interactions
- Ultracold fermions and the SU(N) Hubbard model
- Three-body recombination in a three-state Fermi gas with widely tunable interactions
- Color Superfluidity and "Baryon" Formation in Ultracold Fermions
- Two-color photoassociation spectroscopy of ytterbium atoms and the precise determinations of s-wave scattering lengths
- Optical Flux Lattices for Ultracold Atomic Gases
- Superfluidity and magnetism in multicomponent ultracold fermions
- BCS pairing in Fermi systems with several flavors
- Trionic phase of ultracold fermions in an optical lattice: A variational study
- Pairing in a three component Fermi gas
- Population imbalance and pairing in the BCS-BEC crossover of three-component ultracold fermions
- Fixed point stability and decay of correlations
- Magnetism and domain formation in SU(3)-symmetric multi-species Fermi mixtures
- Co-existence and shell structures of several superfluids in trapped three-component Fermi mixtures
- Phase diagram, extended domain walls, and soft collective modes in a three component fermionic superfluid