Haldane-gap chains in a magnetic field

Abstract

We consider quasi one dimensional spin-1 Heisenberg chains with crystal field anisotropy in a uniform magnetic field. We determine the dynamical structure factor in various limits and obtain a fairly complete qualitative picture of how it changes with the applied field. In particular, we discuss how the width of the higher energy single magnon modes depends on the field. We consider the effects of a weak interchain coupling. We discuss the relevance of our results for recent neutron scattering experiments on the quasi-1D Haldane-gap compound NDMAP.

arXiv comment34 pages, 7 figures

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• Spin-orbit coupled fermions in ladder-like optical lattices at half-filling
• Single-ion anisotropy in Haldane chains and form factor of the O(3) nonlinear sigma model
• Magnetic field induced band insulator to Mott insulator transformations in 4-component alkali fermions at half-filling
• Magnetic phase diagram of a frustrated ferrimagnetic ladder: Relation to the one-dimensional boson Hubbard model
• Bosonic representation of spin operators in the field-induced critical phase of spin-1 Haldane chains
• Long-time divergences in the nonlinear response of gapped one-dimensional many-particle systems
• Strong zero modes in integrable spin-S chains