Long-range spin-pairing order and spin defects in quantum spin-1/2 ladders
Abstract
For w-legged antiferromagnetic spin-1/2 Heisenberg ladders, a long-range spin-pairing order can be identified which enables the separation of the space spanned by finite-range (covalent) valence-bond configurations into w+1 subspaces. Since every subspace has an equivalent counter subspace connected by translational symmetry, twofold degeneracy, breaking traslational symmetry is found except for the subspace where the ground state of w=even belongs to. In terms of energy ordering, (non)degeneracy and the discontinuities introduced in the long-range spin-pairing order by topological spin defects, the differences between even and odd ladders are explained in a general and systematic way.
Cite
@article{arxiv.cond-mat/9910455,
title = {Long-range spin-pairing order and spin defects in quantum spin-1/2 ladders},
author = {M. A. Garcia-Bach},
journal= {arXiv preprint arXiv:cond-mat/9910455},
year = {2015}
}
Comments
16 pages, 7 figures, 2 tables. To be publish in The European Physical J. B