Antiferromagnetism and superfluidity of a dipolar Fermi gas in a 2D optical lattice

Abstract

In a dipolar Fermi gas, the dipole-dipole interaction between fermions can be turned into a dipolar Ising interaction between pseduospins in the presence of an AC electric field. When trapped in a 2D optical lattice, such a dipolar Fermi gas has a very rich phase diagram at zero temperature, due to the competition between antiferromagnetism and superfluidity. At half filling, the antiferromagnetic state is the favored ground state. The superfluid state appears as the ground state at a smaller filling factor. In between there is a phase-separated region. The order parameter of the superfluid state can display different symmetries depending on the filling factor and interaction strength, including d-wave ($d$), extend s-wave ($xs$), or their linear combination ($xs+i\times d$). The implication for the current experiment is discussed.

11 pages, 3 figures, references updated

References in corpus (5)

• A High Phase-Space-Density Gas of Polar Molecules
• Tunable Superfluidity and Quantum Magnetism with Ultracold Polar Molecules
• Reactions of ultracold alkali metal dimers
• Cold polar molecules in 2D traps: Tailoring interactions with external fields for novel quantum phases
• Stable Topological Superfluid Phase of Ultracold Polar Fermionic Molecules

Cited by in corpus (4)

• d-Wave Superfluidity in Optical Lattices of Ultracold Polar Molecules
• Topological $p_x+i{p}_y$ Superfluid Phase of a Dipolar Fermi Gas in a 2D Optical Lattice
• Supersolidity of a dipolar Fermi gas in a cubic optical lattice
• Fractional Quantum Hall States of Dipolar Gases in Chern Bands