Magnetic field effects on the spin dynamics of the linear spin- [formula omitted] Heisenberg antiferromagnet

We present a new approach to the low temperature dynamics of a quantum Heisenberg antiferromagnetic chain, which employs a combination of techniques: exact finite chain calculations; exact Bethe Ansatz calculations; and exact sum rules and selection rules. A striking property of the selection rules...

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Bibliographic Details
Published in:Solid state communications 1981-04, Vol.38 (1), p.1-5
Main Authors: Müller, G., Thomas, H., Beck, H., Bonner, J.C.
Format: Article
Language:English
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Summary:We present a new approach to the low temperature dynamics of a quantum Heisenberg antiferromagnetic chain, which employs a combination of techniques: exact finite chain calculations; exact Bethe Ansatz calculations; and exact sum rules and selection rules. A striking property of the selection rules is that the contribution of several classes of states to the dynamics in non-zero field for finite systems is shown to vanish in the thermodynamic limit. Many novel quantum field-dependent effects appear such as soft modes, and multiple peak structure in the structure factor, which should be experimentally observable.
ISSN:0038-1098
1879-2766
DOI:10.1016/0038-1098(81)91151-0