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

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Science  03 Jun 2011:
Vol. 332, Issue 6034, pp. 1173-1176
DOI: 10.1126/science.1201080

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

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