Abstract
We study the ground state phase diagram of the two-dimensional spin S = 1 2 dimer model with an anisotropic intra-plane coupling. A supersolid phase characterized by a non-uniform bose condensate density that breaks translational symmetry is found when the anisotropy 4 ≳ Δ ≳ 3 . The rich phase diagram contains a checkerboard solid and two different types of superfluid phase with finite staggered magnetization in z -axis and in-plane direction, respectively. We show that the model can be realized if next nearest neighbor (n.n.n.) coupling among dimers is taken into account.
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