The spin-1/2 anisotropic Heisenberg-chain in longitudinal aaand transversal magnetic fields: a DMRG study |
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Authors: | F Capraro C Gros |
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Institution: | 1.Universit?t des Saarlandes, Fakult?t 7.1, Postfach 15 11 50, 66041 Saarbrücken, Germany,DE |
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Abstract: | Using the density matrix renormalization group technique, we evaluate the low-energy spectrum (ground state and first excited
states) of the anisotropic antiferromagnetic spin-one-half chain under magnetic fields. We study both homogeneous longitudinal
and transversal fields as well as the influence of a transversal staggered field on the opening of a spin-gap. We find that
only a staggered transversal field opens a substantial gap.
Received 16 April 2002 / Received in final form 4 July 2002 Published online 17 September 2002 |
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Keywords: | PACS 75 10 Jm Quantized spin models – 75 50 Ee Antiferromagnetics |
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