The 1D spin-1/2 AF-Heisenberg model in a staggered field

Abstract

We investigate the scaling properties of the excitation energies and transition amplitudes of the one-dimensional spin-$\frac{1}{2}$ antiferromagnetic Heisenberg model exposed to an external perturbation. Two types of perturbations are discussed in detail: a staggered field and a dimerized field.

10 pages, 6 figures, to be published in Euro. Phys. J. B, LaTeX-class svjour from Springer

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• The gap exponent of XXZ model in a transverse field
• Scaling behavior of the energy gap of spin-1/2 AF-Heisenberg chain in both uniform and staggered fields
• Soft modes, Gaps and Magnetization Plateaus in 1D Spin-1/2 Antiferromagnetic Heisenberg Models