Spin dynamics of the triangular Heisenberg antiferromagnet: A Schwinger-boson approach
Journal Article
·
· Physical Review, B: Condensed Matter
- Institute of Theoretical Physics, Chalmers University of Technology Goeteborg University, S-41296 Goeteborg (Sweden)
We have analyzed the two-dimensional antiferromagnetic Heisenberg model on the triangular lattice using a Schwinger-boson mean-field theory. By expanding around a state with local 120{degree} order, we obtain, in the limit of infinite spin, results for the excitation spectrum in complete agreement with linear spin-wave theory (LSWT). In contrast to LSWT, however, the modes at the ordering wave vectors acquire a mass for finite spin. We discuss the origin of this effect.
- OSTI ID:
- 44525
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 51; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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