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We study the checkerboard supersolid of the hard-core Bose-Hubbard model withthe dipole-dipole interaction. This supersolid is different from all othersupersolids found in lattice models in the sense that superflow paths throughwhich interstitials or vacancies can hop freely are absent in the crystal. Byfocusing on repulsive interactions between interstitials, we reveal that thelong-range tail of the dipole-dipole interaction have the role of increasingthe energy cost of domain wall formations. This effect produces the supersolidby the second-order hopping process of defects. We also perform exact quantumMonte Carlo simulations and observe a novel double peak structure in themomentum distribution of bosons, which is a clear evidence for supersolid. Thiscan be measured by the time-of-flight experiment in optical lattice systems.

Novel Mechanism of Supersolid of Ultracold Polar Molecules in Optical Lattices