d-Wave Superfluidity in Optical Lattices of Ultracold Polar Molecules

Abstract

Recent work on ultracold polar molecules, governed by a generalization of the t-J Hamiltonian, suggests that molecules may be better suited than atoms for studying d-wave superfluidity due to stronger interactions and larger tunability of the system. We compute the phase diagram for polar molecules in a checkerboard lattice consisting of weakly coupled square plaquettes. In the simplest experimentally realizable case where there is only tunneling and an XX-type spin-spin interaction, we identify the parameter regime where d-wave superfluidity occurs. We also find that the inclusion of a density-density interaction destroys the superfluid phase and that the inclusion of a spin-density or an Ising-type spin-spin interaction can enhance the superfluid phase. We also propose schemes for experimentally realizing the perturbative calculations exhibiting enhanced d-wave superfluidity.

22 pages, 12 figures; v2: revised discussions

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Cited by in corpus (21)

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• Supersolidity of a dipolar Fermi gas in a cubic optical lattice
• Interaction induced fractionalization and topological superconductivity in the polar molecules anisotropic $t-J$ model
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• Multiorder topological superfluid phase transitions in a two-dimensional optical superlattice
• Disorder effects on superconducting tendencies in the checkerboard Hubbard model
• Orbital physics of polar Fermi molecules
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• Quantum state tomography on a plaquette in the 2D Hubbard model
• Lattice models with long-range and number-non-conserving interactions with Zeeman excitations of ultracold magnetic atoms
• Two-state Bogoliubov theory of a molecular Bose gas