Abstract
We provide strong numerical evidence, using improved variational wave functions, for a ground state with vanishing spin gap in the spin- quantum Heisenberg model on the kagome lattice. Starting from the algebraic Dirac spin liquid state proposed by Ran et al. [Phys. Rev. Lett. 98, 117205 (2007)] and iteratively applying a few Lanczos steps, we compute the lowest excitation constructed by exciting spinons close to the Dirac nodes. Our results are compatible with a vanishing spin gap in the thermodynamic limit and in consonance with a power-law decay of long distance spin-spin correlations in real space. The competition with a gapped (topological) spin liquid is discussed.
- Received 23 November 2013
DOI:https://doi.org/10.1103/PhysRevB.89.020407
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