Spin liquid phase in a quantum magnet on the kagome lattice
arXiv:cond-mat/0607778 · doi:10.1103/PhysRevLett.97.207204
Abstract
We study a model of hard-core bosons with short-range repulsive interactions at half-filling on the kagome lattice. Using quantum Monte Carlo (QMC) numerics, we find that this model shows a continuous superfluid to insulator quantum phase transition, with exponents and . The insulator, $\cI^*$, exhibits short-ranged density and bond correlations, topological order and exponentially decaying spatial vison correlations, all of which point to a fractionalized phase. We estimate the vison gap in $\cI^*$ from the temperature dependence of the energy. Our results, together with the equivalence between hard-core bosons and spins, provide compelling evidence for a spin-liquid phase in an easy-axis spin-1/2 model with no special conservation laws.
arXiv comment4 pages, 6 figures, published version
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