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Supersolid phase in spin dimer XXZ systems under magnetic field

Kwai-Kong Ng·T. K. Lee
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Abstract

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 $4 \gtrsim Δ\gtrsim 3$, 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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Kwai-Kong Ng, T. K. Lee. 2006-04-25. Supersolid phase in spin dimer XXZ systems under magnetic field. https://doi.org/10.1103/physrevlett.97.127204

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