Phys. Rev. B 51, 11574–11579 (1995)Spin dynamics of the triangular Heisenberg antiferromagnet: A Schwinger-boson approachReceived 27 September 1994; published in the issue dated 1 May 1995 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° 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. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.51.11574
DOI:
10.1103/PhysRevB.51.11574
PACS:
75.10.Jm, 75.50.Ee, 75.30.Ds
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