Absence of gap for infinite half--integer spin ladders with an odd number of legs

Details Absence of gap for infinite half--integer spin ladders with an odd number of legs Absence of gap for infinite half--integer spin ladders with an odd number of legs

1995-12-15

arxiv.org/abs/cond-mat/9512118v1

Physics

Condensed Matter

REVTeX, 8 pages

Scientific paper

10.1103/PhysRevB.53.9172

A proof is presented for the absence of gap for spin $1/2$ ladders with an
odd number of legs, in the infinite leg length limit. This result is relevant
to the current discussion of coupled one--dimensional spin systems, a physical
realization of which are vanadyl pyrophosphate, (VO)$_2$P$_2$O$_7$, and
stoichiometric Sr$_{n-1}$ Cu$_{n+1}$ O$_{2n}$ (with $n=3,5,7,9,\dots$).

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