1995/03/09 by Ann Mattsson · 1 citation
Physics and Astronomy · #cond-mat
paper · pdf · doi:10.1103/physrevb.51.11574
15 pages REVTEX 3.0 preprint, 6 postscript figures ( uuencoded and compressed using the script uufiles ) are submitted separately.
arxiv created 1995/03/09 · arxiv updated 2016/08/31
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.