Fermionic Superfluid from a Bilayer Band Insulator in an Optical Lattice

Abstract

We propose a model to realize a fermionic superfluid state in an optical lattice circumventing the cooling problem. Our proposal exploits the idea of tuning the interaction in a characteristically low entropy state, a band-insulator in an optical bilayer system, to obtain a superfluid. By performing a detailed analysis of the model including fluctuations and augmented by a variational quantum Monte Carlo calculations of the ground state, we show that the superfluid state obtained has high transition temperature of the order of the hopping energy. Our system is designed to suppress other competing orders such as a charge density wave. We suggest a laboratory realization of this model via an orthogonally shaken optical lattice bilayer.

5 pages, 7 figures, typos fixed, figures modified

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Cited by in corpus (9)

• Superfluidity of a dipolar Fermi gas in 2D optical lattices bilayer
• Supersolid phases of dipolar fermions in a two-dimensional-lattice bilayer array
• Increasing superconducting $T_c$ by layering in the attractive Hubbard model
• Finite temperature study of correlations in bilayer band-insulator
• Interplay of disorder and interactions in the bilayer band-insulator : A determinant quantum Monte Carlo study
• Parameters dependent superconducting transition temperature in high temperature superconductors
• Density redistribution effects in fermionic optical lattices
• Obstructed Atomic Insulators and Superfluids of Fermions Coupled to ${\mathbb{Z}}_2$ Gauge Fields
• Trion formation and ordering in the attractive SU(3) Fermi-Hubbard model