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

Abstract

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.

12 pages, 10 figures

References in corpus (5)

• Bose-Einstein Condensation in Magnetic Insulators
• Supersolid hardcore bosons on the triangular lattice
• Generalized Directed Loop Method for Quantum Monte Carlo Simulations
• Supersolids versus phase separation in two-dimensional lattice bosons
• Numerical Contractor Renormalization Method for Quantum Spin Models