Spin-Liquid Ground State of the S = 1/2 Kagome Heisenberg Antiferromagnet

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Science  28 Apr 2011:
DOI: 10.1126/science.1201080


We use the density matrix renormalization group to perform accurate calculations of the ground state of the nearest-neighbor S = 1/2 Heisenberg antiferromagnet on the kagome lattice. We study this model on numerous long cylinders with circumferences up to 12 lattice spacings. Our results, through a combination of very low energy and small finite size effects, provide strong evidence that for the infinite two-dimensional system, the ground state of this model is a fully gapped spin liquid.