Supersolid phase in spin dimer XXZ systems under magnetic field

Details Supersolid phase in spin dimer XXZ systems under magnetic field Supersolid phase in spin dimer XXZ systems under magnetic field

2006-04-25

arxiv.org/abs/cond-mat/0604570v1

Physics

Condensed Matter

Other Condensed Matter

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.97.127204

Using quantum Monte Carlo method, we study, under external magnetic fields, the ground state phase diagram of the two-dimensional spin $S$=1/2 dimer model with an anisotropic intra-plane antiferromagnetic coupling. With the anisotropy $4 \gtrsim \Delta \gtrsim 3$, a supersolid phase characterized by a non-uniform bose condensate density that breaks translational symmetry is found. The rich phase diagram also contains a checkerboard solid and two different types of superfluid phase formed by $S_z=+1$ and $S_z=0$ spin triplets, with finite staggered magnetization in z-axis and in-plane direction, respectively. As we show, the model can be realized as a consequence of including the next nearest neighbor coupling among dimers and our results suggest that spin dimer systems may be an ideal model system to study the supersolid phase.

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