Strongly fluctuating fermionic superfluid in attractive π-flux Hubbard model
arXiv:1401.1586 · doi:10.1103/PhysRevA.89.013619
Abstract
Ultracold atoms in optical lattice provides a platform to realize the superfluid (SF) state, a quantum order with paired charge-neutral fermions. In this paper, we studied SF state in the twodimensional attractive Hubbard model with pi-flux on each plaquette. The SF state in the pi-flux lattice model suffers very strong quantum fluctuations and the ground state becomes a possible quantum phase liquid state. In this phase, there exists the Cooper pairing together with a finite energy gap for the atoms, but no long range SF phase coherence exists at zero temperature. In addition, we discussed the properties of the SF vortices.
11 pages, 8 figures
References in corpus (6)
- Many-Body Physics with Ultracold Gases
- Theory of ultracold Fermi gases
- Realization of the Hofstadter Hamiltonian with ultracold atoms in optical lattices
- Realizing the Harper Hamiltonian with Laser-Assisted Tunneling in Optical Lattices
- Berezinskii-Kosterlitz-Thouless transition and BCS-Bose crossover in the two-dimensional attractive Hubbard model
- Spin-charge Separation in Nodal Antiferromagnetic Insulator