Spatially-modulated Superfluid States in Fermionic Optical Ladder Systems with Repulsive Interactions
arXiv:0809.4114 · doi:10.1103/PhysRevA.79.013610
Abstract
We investigate two-component ultracold fermionic atoms with repulsive interactions trapped in an optical lattice with a ladder structure. By applying the Bogoliubov-de Gennes equations to an effective t-J model in the strong correlation limit, we discuss how the spatially-modulated spin-singlet pairs with d-wave like symmetry are formed in the systems with trapping potentials. Furthermore, a close examination of the condensation energy as well as the local average of potential, kinetic and exchange energies by means of the variational Monte Carlo method elucidates that local particle correlations enhance the stability of the superfluid state via substantial energy gain due to singlet pairing in the high particle density region.
8 pages, 5 figures
References in corpus (28)
- Many-Body Physics with Ultracold Gases
- Time-resolved Observation and Control of Superexchange Interactions with Ultracold Atoms in Optical Lattices
- A lattice of double wells for manipulating pairs of cold atoms
- Evidence for Superfluidity of Ultracold Fermions in an Optical Lattice
- Degenerate Fermi Gases of Ytterbium
- Molecules of Fermionic Atoms in an Optical Lattice
- Formation of spatial shell structures in the superfluid to Mott insulator transition
- Pairing states of a polarized Fermi gas trapped in a one-dimensional optical lattice
- Local quantum criticality in confined fermions on optical lattices
- Quasi-one-dimensional polarized Fermi superfluids
- BCS-BEC crossover on the two-dimensional honeycomb lattice
- Mott transition of fermionic atoms in a three-dimensional optical trap
- Fulde-Ferrell-Larkin-Ovchinnikov superfluidity in one-dimensional optical lattices
- d-wave resonating valence bond states of fermionic atoms in optical lattices
- Spin dynamics for bosons in an optical lattice
- Quantum phases of bosons in double-well optical lattices
- FFLO state in 1, 2, and 3 dimensional optical lattices combined with a non-uniform background potential
- Superfluid-Insulator Transition of Strongly Interacting Fermi Gases in Optical Lattices
- Luther-Emery Phase and Atomic-Density Waves in a Trapped Fermion Gas
- Cold Attractive Spin Polarized Fermi Lattice Gases and the Doped Positive U Hubbard Model
- Supersolid state of ultracold fermions in an optical lattice
- Competing superfluid and density-wave ground-states of fermionic mixtures with mass imbalance in optical lattices
- Supersolids in confined fermions on one-dimensional optical lattices
- Magnetic and superfluid phases of confined fermions in two-dimensional optical lattices
- Stability of Superflow for Ultracold Fermions in Optical Lattices
- Population imbalanced fermions in harmonically trapped optical lattices
- Quantum phases of Fermi-Fermi mixtures in optical lattices
- Variational Monte Carlo analysis of the Hubbard model with a confining potential: one-dimensional fermionic optical lattice systems