%0 Journal Article
%T Bosonic Mean Field Theory of the Spiral Phases of Heisenberg Antiferromagnets on a Chain
%A Sumathi Rao
%A Diptiman Sen
%J Physics
%D 1992
%I arXiv
%R 10.1103/PhysRevB.48.12763
%X We develop a novel bosonic mean field theory to describe the spiral phases of a Heisenberg antiferromagnet on a one-dimensional chain, in terms of three bosons at each site. The ground state is disordered and for large values of the spin $S$, two different and exponentially small energy gaps are found. The spin-spin correlation function is computed and is shown to decay exponentially at large distances. Our mean field theory is also shown to be exact in a large-$N$ generalization.
%U http://arxiv.org/abs/cond-mat/9212013v2