Abstract
Recent work on ultracold polar molecules, governed by a generalization of the - Hamiltonian, suggests that molecules may be better suited than atoms for studying -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 -type spin-spin interaction, we identify the parameter regime where -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 -wave superfluidity.
5 More- Received 24 October 2011
DOI:https://doi.org/10.1103/PhysRevA.84.063639
©2011 American Physical Society