Spin-Frame Field Theory of a Three-Sublattice Antiferromagnet
- 1 March 2024
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 132 (9) , 096703
Abstract
We present a nonlinear field theory of a three-sublattice hexagonal antiferromagnet. The order parameter is the spin frame, an orthogonal triplet of vectors related to sublattice magnetizations and spin chirality. The exchange energy, quadratic in spin-frame gradients, has three coupling constants, only two of which manifest themselves in the bulk. As a result, the three spin-wave velocities satisfy a universal relation. Vortices generally have an elliptical shape with the eccentricity determined by the Lamé parameters.Keywords
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Funding Information
- U.S. Department of Energy (DE-SC0019331)
- National Science Foundation (NSF PHY-1748958, PHY-2309135)
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