Pair condensation in the BCS-BEC crossover of ultracold atoms loaded onto a 2D square lattice
arXiv:1208.1194 · doi:10.1103/PhysRevA.86.023619
Abstract
We investigate the crossover from the Bardeen-Cooper-Schrieffer (BCS) state of weakly-bound Cooper pairs to the Bose-Einstein Condensate (BEC) of strongly-bound molecular dimers in a gas of ultracold atoms loaded on a two-dimensional optical lattice. By using the the mean-field BCS equations of the emerging Hubbard model and the concept of off-diagonal-long-range-order for fermions we calculate analytically and numerically the pair binding energy, the energy gap and the condensate fraction of Cooper pairs as a function of interaction strength and filling fractor of atoms in the lattice at zero temperature.
arXiv comment7 pages, 5 figures, to be published in Phys. Rev. A
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Cited by in corpus (7)
- Direct observation of non-local fermion pairing in an attractive Fermi-Hubbard gas
- Superfluidity, Sound Velocity and Quasi Condensation in the 2D BCS-BEC Crossover
- Spin-orbit Coupling Effects on the Superfluidity of Fermi Gas in an Optical Lattice
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- Quantum droplets in two-dimensional optical lattices
- Fermionic condensation in ultracold atoms, nuclear matter and neutron stars