Bosonic Mean Field Theory of the Spiral Phases of Heisenberg Antiferromagnets on a Chain

Details Bosonic Mean Field Theory of the Spiral Phases of Heisenberg Antiferromagnets on a Chain Bosonic Mean Field Theory of the Spiral Phases of Heisenberg Antiferromagnets on a Chain

1992-12-09

arxiv.org/abs/cond-mat/9212013v2

Phys.Rev. B48 (1993) 12763-12767

Physics

Condensed Matter

plain.tex, TIFR/TH/92-66, IISc/CTS/92-12

Scientific paper

10.1103/PhysRevB.48.12763

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.

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