LOFF and breached pairing with cold atoms
arXiv:cond-mat/0611058 · doi:10.1140/epjd/e2009-00046-4
Abstract
We investigate here the Cooper pairing of fermionic atoms with mismatched fermi surfaces using a variational construct for the ground state. We determine the state for different values of the mismatch of chemical potential for weak as well as strong coupling regimes including the BCS BEC cross over region. We consider Cooper pairing with both zero and finite net momentum. Within the variational approximation for the ground state and comparing the thermodynamic potentials, we show that (i) the LOFF phase is stable in the weak coupling regime, (ii) the LOFF window is maximum on the BEC side near the Feshbach resonance and (iii) the existence of stable gapless states with a single fermi surface for negative average chemical potential on the BEC side of the Feshbach resonance.
14 pages including 10 figures, Some figures redrawn with more data points, more references added, few sentences added in discussions, version to appear in Eur. Phys. Journal D
References in corpus (18)
- Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
- Direct Observation of the Superfluid Phase Transition in Ultracold Fermi Gases
- Epsilon expansion for a Fermi gas at infinite scattering length
- Two lectures on color superconductivity
- Mean field phase diagrams of imbalanced Fermi gases near a Feshbach resonance
- Finite temperature phase diagram of a polarized Fermi gas in an optical lattice
- LOFF Pairing vs. Breached Pairing in Asymmetric Fermion Superfluids
- BCS-BEC crossover in an asymmetric two-component Fermi gas
- Testing the Ginzburg-Landau approximation for three-flavor crystalline color superconductivity
- Stability conditions and Fermi surface topologies in a superconductor
- Breached Superfluidity via P-Wave Coupling
- Evaluating the phase diagram of superconductors with asymmetric spin populations
- Stable gapless superconductivity at strong coupling
- Quantum phases of Fermi-Fermi mixtures in optical lattices
- Color Superconductivity of QCD at High Baryon Density
- Color superconductivity with determinant interaction in strange quark matter
- Pairing in spin polarized two-species fermionic mixtures with mass asymmetry
- Phase Transition in Imbalanced Fermion Superfluids
Cited by in corpus (5)
- Dimensional Crossover in a Spin-imbalanced Fermi gas
- Superfluidity of a spin-imbalanced Fermi gas in a three-dimensional optical lattice
- Stability of the Breached Pair State for a Two-species Fermionic System in the Presence of Feshbach Resonance
- Collective excitations of an imbalanced fermion gas in a 1D optical lattice
- Trap and population imbalanced two-component Fermi gas in the BEC limit