Vortices in Quantum Spin Systems

Details Vortices in Quantum Spin Systems Vortices in Quantum Spin Systems

1998-09-30

arxiv.org/abs/cond-mat/9809401v2

Eur. Phys. J. B 9, 237 (1999)

Physics

Condensed Matter

Remarks added and conclusions enlarged, version to be published in European Physical Journal B

Scientific paper

We examine spin vortices in ferromagnetic quantum Heisenberg models with planar anisotropy on two-dimensional lattices. The symmetry properties and the time evolution of vortices built up from spin-coherent states are studied in detail. Although these states show a dispersion typical for wave packets, important features of classical vortices are conserved. Moreover, the results on symmetry properties provide a construction scheme for vortex-like excitations from exact eigenstates, which have a well-controlled time evolution. Our approach works for arbitrary spin length both on triangular and square lattices.

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