Density matrix renormalization group (DMRG) calculations on large systems (up to 3096 spins) indicate that the ground state of the Heisenberg model on a 3-chain Kagome strip is spontaneously dimerized. This system has degenerate ground states and a gap to triplet and singlet excitations. These results are in direct contradiction with recent results of Azaria et al (Phys. Rev. Lett. 81, 1694 (1998)) and suggest a need for a reexamination of the underlying field theory.
@article{arxiv.cond-mat/0003037,
title = {Comment on "Kagome Lattice Antiferromagnet Stripped to Its Basics"},
author = {Steven R. White and Rajiv R. P. Singh},
journal= {arXiv preprint arXiv:cond-mat/0003037},
year = {2009}
}