Analysis of superfluid state of ultracold fermions with attractive interactions in two-dimensional optical lattices

✍ Scribed by Yusuke Fujihara; Akihisa Koga; Norio Kawakami

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 274 KB
• Volume: 470
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2009.12.001

✦ Synopsis

We discuss the ground state properties of a Fermi gas with attractive interactions trapped in a twodimensional optical lattice. By making use of the variational Monte Carlo method, we show that the system has an instability toward a density-wave state as well as a superfluid state. We also discuss how the additional staggered potential and inter-site Coulomb repulsion stabilize the supersolid region where a superfluid state coexists with a density-wave state.