Massive and Massless Behavior in Dimerized Spin Ladders

Preprint

12 February 1999

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/9810263

Abstract

We investigate the conditions under which a gap vanishes in the spectrum of dimerized coupled spin-1/2 chains by means of Abelian bosonization and Lanczos diagonalization techniques. Although both interchain ($J'$) and dimerization ($\delta$) couplings favor a gapful phase, it is shown that a suitable choice of these interactions yields massless spin excitations. We also discuss the influence of different arrays of relative dimerization on the appearance of non-trivial magnetization plateaus.

Keywords

MASSLESS BEHAVIOR
DIMERIZED SPIN
DIMERIZATION
SPIN LADDERS
COUPLINGS
GAPFUL

All Related Versions

Version 1, 1998-10-20, ArXiv
Version 2, 1999-02-12, ArXiv
Published version: Physical Review Letters, 82 (8), 1768.

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