



01352nas a2200145   4500008004100000245007400041210006900115260001500184490000700199520089800206100002001104700002001124700002501144856003701169       2011                        eng d00ad-Wave Superfluidity in Optical Lattices of Ultracold Polar Molecules0 adWave Superfluidity in Optical Lattices of Ultracold Polar Molec  c2011/12/290 v843 a  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.
1 aKuns, Kevin, A.1 aRey, Ana, Maria1 aGorshkov, Alexey, V.  uhttp://arxiv.org/abs/1110.5330v2