Mechanisms for Spin-Supersolidity in S=1/2 Spin-Dimer Antiferromagnets

Details Mechanisms for Spin-Supersolidity in S=1/2 Spin-Dimer Antiferromagnets Mechanisms for Spin-Supersolidity in S=1/2 Spin-Dimer Antiferromagnets

2008-07-25

arxiv.org/abs/0807.4190v1

Phys. Rev. B 78, 184418 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 10 figures

Scientific paper

10.1103/PhysRevB.78.184418

Using perturbative expansions and the contractor renormalization (CORE) algorithm, we obtain effective hard-core bosonic Hamiltonians describing the low-energy physics of $S=1/2$ spin-dimer antiferromagnets known to display supersolid phases under an applied magnetic field. The resulting effective models are investigated by means of mean-field analysis and quantum Monte Carlo simulations. A "leapfrog mechanism", through means of which extra singlets delocalize in a checkerboard-solid environment via correlated hoppings, is unveiled that accounts for the supersolid behavior.

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