Absence of the Hopf invariant in the long-wavelength action of two-dimensional quantum antiferromagnets
- 1 October 1988
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 38 (10), 7181-7183
- https://doi.org/10.1103/physrevb.38.7181
Abstract
Contrary to recent theoretical suggestions, we show that the long-wavelength action of a two-dimensional quantum antiferromagnet on a square lattice can be mapped onto a classical (2+1) nonlinear model without any additional topological term.
Keywords
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