Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-10-27
Physics
Condensed Matter
Strongly Correlated Electrons
16 pages, 7 figures, 2 tables. To be publish in The European Physical J. B
Scientific paper
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.
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