Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-04-05
Physics
Condensed Matter
Strongly Correlated Electrons
to appear in Physical Review B
Scientific paper
10.1103/PhysRevB.63.224417
The spin-1/2 antiferromagnetic zig-zag ladder is studied by exact diagonalization of small systems in the regime of weak inter-chain coupling. A gapless phase with quasi long-range spiral correlations has been predicted to occur in this regime if easy-plane (XY) anisotropy is present. We find in general that the finite zig-zag ladder shows three phases: a gapless collinear phase, a dimer phase and a spiral phase. We study the level crossings of the spectrum,the dimer correlation function, the structure factor and the spin stiffness within these phases, as well as at the transition points. As the inter-chain coupling decreases we observe a transition in the anisotropic XY case from a phase with a gap to a gapless phase that is best described by two decoupled antiferromagnetic chains. The isotropic and the anisotropic XY cases are found to be qualitatively the same, however, in the regime of weak inter-chain coupling for the small systems studied here. We attribute this to a finite-size effect in the isotropic zig-zag case that results from exponentially diverging antiferromagnetic correlations in the weak-coupling limit.
Guihery Nathalie
Rodriguez Jose P.
Sacramento Pedro D.
Vieira Vitor Rocha
No associations
LandOfFree
Decoupling of the S=1/2 antiferromagnetic zig-zag ladder with anisotropy does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Decoupling of the S=1/2 antiferromagnetic zig-zag ladder with anisotropy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Decoupling of the S=1/2 antiferromagnetic zig-zag ladder with anisotropy will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-602628