Spin-wave theory of the Haldane gap in one-dimensional antiferromagnets
- 1 August 1990
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 42 (4) , 2589-2590
- https://doi.org/10.1103/physrevb.42.2589
Abstract
We point out that spin-wave theory with the additional constraint introduced by Hirsch and Tang predicts a gap in the spectrum of one-dimensional isotropic antiferromagnets at T=0, in agreement with the Haldane result for S=1. At finite temperatures the gap is comparable to the experimental values in .
Keywords
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