d-Wave Superfluidity in Optical Lattices of Ultracold Polar Molecules

Details d-Wave Superfluidity in Optical Lattices of Ultracold Polar Molecules d-Wave Superfluidity in Optical Lattices of Ultracold Polar Molecules

2011-10-24

arxiv.org/abs/1110.5330v2

Phys. Rev. A 84, 063639 (2011)

Physics

Condensed Matter

Quantum Gases

22 pages, 12 figures; v2: revised discussions

Scientific paper

10.1103/PhysRevA.84.063639

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.

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