Massive and Massless Behavior in Dimerized Spin Ladders

Details Massive and Massless Behavior in Dimerized Spin Ladders Massive and Massless Behavior in Dimerized Spin Ladders

1998-10-20

arxiv.org/abs/cond-mat/9810263v2

Phys. Rev. Lett. 82, 1768 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, RevTex, 5 Postscript figures

Scientific paper

10.1103/PhysRevLett.82.1768

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.

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