Abstract
Entanglement renormalization techniques are applied to numerically investigate the ground state of the spin- Heisenberg model on a kagome lattice. Lattices of sites with periodic boundary conditions are considered. For the infinite lattice, the best approximation to the ground state is found to be a valence bond crystal with a 36-site unit cell, compatible with a previous proposal. Its energy per site, , is an exact upper bound and is lower than the energy of any previous (gapped or algebraic) spin liquid candidate for the ground state.
- Received 23 April 2009
DOI:https://doi.org/10.1103/PhysRevLett.104.187203
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