Spin dynamics of the S=1/2 antiferromagnetic zig-zag ladder with anisotropy

Details Spin dynamics of the S=1/2 antiferromagnetic zig-zag ladder with anisotropy Spin dynamics of the S=1/2 antiferromagnetic zig-zag ladder with anisotropy

2002-01-08

arxiv.org/abs/cond-mat/0201098v1

Journal of Physics Condensed Matter 14, 591 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

17 figures

Scientific paper

10.1088/0953-8984/14/3/326

We use exact diagonalization and the modified Lanczos method to study the finite energy and finite momentum spectral weight of the longitudinal and transverse spin excitations of the anisotropic zig-zag ladder. We find that the spin excitations form continua of gapless or gapped spinons in the different regions of the phase diagram. The results obtained are consistent with a picture previously proposed that in the anisotropic case there is a transition from a gapped regime to a gapless regime, for small interchain coupling. In this regime we find a sharp low-energy peak in the structure function for the transverse spin excitations, consistent with a finite stiffness.

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