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  • Title: Density matrix renormalization group numerical study of the kagome antiferromagnet.
    Author: Jiang HC, Weng ZY, Sheng DN.
    Journal: Phys Rev Lett; 2008 Sep 12; 101(11):117203. PubMed ID: 18851324.
    Abstract:
    We numerically study the spin-1/2 antiferromagnetic Heisenberg model on the kagome lattice using the density-matrix renormalization group method. We find that the ground state is a magnetically disordered spin liquid, characterized by an exponential decay of spin-spin correlation function in real space and a magnetic structure factor showing system-size independent peaks at commensurate magnetic wave vectors. We obtain a spin triplet excitation gap DeltaE(S=1)=0.055+/-0.005 by extrapolation based on the large size results, and confirm the presence of gapless singlet excitations. The physical nature of such an exotic spin liquid is also discussed.
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