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

Abstract

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.

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

References in corpus (1)

• Possible Quantum Spin Liquid States on the Triangular and Kagome Lattices

Cited by in corpus (5)

• Dynamical structure factor of the triangular antiferromagnet: the Schwinger boson theory beyond the mean field approach
• Schwinger boson theory of ordered magnets
• Valence-bond-solid order in antiferromagnets with spin-lattice coupling
• Dynamical spin correlations in kagome antiferromagnets: comparison of Abrikosov fermion and Schwinger boson approaches beyond mean field
• Schwinger boson theory for $S=1$ Kitaev quantum spin liquids