Energy of bond defects in quantum spin chains obtained from local approximations and from exact diagonalization

Details Energy of bond defects in quantum spin chains obtained from local approximations and from exact diagonalization Energy of bond defects in quantum spin chains obtained from local approximations and from exact diagonalization

2007-08-29

arxiv.org/abs/0708.4004v1

J. Magn. Magn. Mater 320, p. E418-E420 (2008)

Physics

Condensed Matter

Materials Science

3 pages, 2 figures. Manuscript accepted by Journal of Magnetism and Magnetic Materials, special issue for LAWMMM 2007 conferen

Scientific paper

10.1016/j.jmmm.2008.02.187

We study the influence of ferromagnetic and antiferromagnetic bond defects on the ground-state energy of antiferromagnetic spin chains. In the absence of translational invariance, the energy spectrum of the full Hamiltonian is obtained numerically, by an iterative modification of the power algorithm. In parallel, approximate analytical energies are obtained from a local-bond approximation, proposed here. This approximation results in significant improvement upon the mean-field approximation, at negligible extra computational effort.

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