Phase diagram, extended domain walls, and soft collective modes in a three component fermionic superfluid
arXiv:0805.3663 · doi:10.1103/PhysRevA.78.033615
Abstract
We study the phase diagram of a three-component Fermi gas with weak attractive interactions, which shows three superfluid and one normal phases. At weak symmetry breaking between the components the existence of domain walls interpolating between two superfluids introduces a new length scale much larger than the coherence length of each superfluid. This, in particular, limits the applicability of the local density approximation in the trapped case, which we also discuss. In the same regime the system hosts soft collective modes with a mass much smaller than the energy gaps of individual superfluids. We derive their dispersion relations at zero and finite temperatures and demonstrate that their presence leads to a significant enhancement of fluctuations near the superfluid-normal transitions.
16+ pages, 6 figures. Published version
References in corpus (16)
- Weakly bound dimers of fermionic atoms
- Ultracold fermions and the SU(N) Hubbard model
- Exploring an ultracold Fermi-Fermi mixture: Interspecies Feshbach resonances and scattering properties of 6Li and 40K
- Quantum degenerate two-species Fermi-Fermi mixture coexisting with a Bose-Einstein condensate
- Precision Measurements of Collective Oscillations in the BEC-BCS Crossover
- BEC-BCS crossover, phase transitions and phase separation in polarized resonantly-paired superfluids
- Tomographic RF Spectroscopy of a Trapped Fermi Gas at Unitarity
- Determination of the Fermion Pair Size in a Resonantly Interacting Superfluid
- Superfluidity and magnetism in multicomponent ultracold fermions
- Interface Tension of Bose-Einstein Condensates
- Finite temperature phase diagram of a polarized Fermi gas in an optical lattice
- Surface Tension in Unitary Fermi Gases with Population Imbalance
- BCS pairing in Fermi systems with several flavors
- Pairing in a three component Fermi gas
- Superfluidity in a Three-flavor Fermi Gas with SU(3) Symmetry
- Co-existence and shell structures of several superfluids in trapped three-component Fermi mixtures