Spin Dynamics of the Triangular Heisenberg Antiferromagnet: A Schwinger Boson Approach

Details Spin Dynamics of the Triangular Heisenberg Antiferromagnet: A Schwinger Boson Approach Spin Dynamics of the Triangular Heisenberg Antiferromagnet: A Schwinger Boson Approach

1995-03-09

arxiv.org/abs/cond-mat/9503048v1

Physics

Condensed Matter

15 pages REVTEX 3.0 preprint, 6 postscript figures ( uuencoded and compressed using the script uufiles ) are submitted separat

Scientific paper

10.1103/PhysRevB.51.11574

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 $120^\circ$ 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.

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