Multiband-Driven Superfluid-Insulator Transition of Fermionic Atoms in Optical Lattices: A Dynamical Mean-Field-Theory Study

Abstract

The superfluid-insulator transitions of the fermionic atoms in optical lattices are investigated by the two-site dynamical mean-field theory. It is shown that the Mott transition occurs as a result of the multiband effects. The quasiparticle weight in the superfluid state decreases significantly, as the system approaches the Mott transition point. By changing the interaction and the orbital splitting, we obtain the phase diagram at half filling. The numerical results are discussed in comparison with the effective boson model.

4 pages, 3 figures, Phys. Rev. A 77, 043624 (2008)

References in corpus (5)

• Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
• Molecular Probe of Pairing in the BEC-BCS Crossover
• Evidence for Superfluidity of Ultracold Fermions in an Optical Lattice
• High-spin to low-spin and orbital polarization transitions in multiorbital Mott systems
• Superfluid-Insulator Transition of Strongly Interacting Fermi Gases in Optical Lattices

Cited by in corpus (3)

• Supersolid state of ultracold fermions in an optical lattice
• Supersolid state in fermionic optical lattice systems
• Density-Wave and Antiferromagnetic States of Fermionic Atoms in Optical Lattices