Topological $p_x+i{p}_y$ Superfluid Phase of a Dipolar Fermi Gas in a 2D Optical Lattice

Abstract

In a dipolar Fermi gas, the anisotropic interaction between electric dipoles can be turned into an effectively attractive interaction in the presence of a rotating electric field. We show that the topological $p_x+i{p}_y$ superfluid phase can be realized in a single-component dipolar Fermi gas trapped in a 2D square optical lattice with this attractive interaction at low temperatures. The $p_x+i{p}_y$ superfluid state has potential applications for topological quantum computing. We obtain the phase diagram of this system at zero temperature. In the weak-coupling limit, the p-wave superfluid phase is stable for all filling factors. As the interaction strength increases, it is stable close to filling factors $n=0$ or $n=1$, and phase separation takes place in between. When the interaction strength is above a threshold, the system is phase separated for any $0<n<1$. The transition temperature of the $p_x+i{p}_y$ superfluid state is estimated and the implication for experiments is discussed.

10 pages, 4 figures

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• Fractional Quantum Hall States of Dipolar Gases in Chern Bands
• Superfluidity of a dipolar Fermi gas in 2D optical lattices bilayer
• Two-Dimensional Thouless Pumping of Ultracold Fermions in Obliquely Introduced Optical Superlattice
• Enhancing the Thermal Stability of Majorana Fermions with Redundancy Using Dipoles in Optical Lattices
• Multipolar Fermi-surface deformation in a Rydberg-dressed Fermi gas with long-range anisotropic interactions
• p-wave Superfluid Phases of Fermi Molecules in a Bilayer Lattice Array
• Emergent interlayer nodal superfluidity of a dipolar fermi gas in bilayer optical lattices
• Stabilizing Topological Superfluidity of Lattice Fermions
• Unconventional superconductivity from electronic dipole fluctuations