The 1/N Expansion and Long Range Antiferromagnetic Order

Preprint

18 February 1993

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/9302024

Abstract

The staggered magnetization of the Heisenberg antiferromagnet in two dimensions can be systematically approximated by a 1/N expansion. Cancellation between self energy diagrams leads to a Luttinger-like theorem for the ground state. We prove (for a smooth enough self energy) that the long range order of mean field theory ($N$=$\infty$) survives corrections to all orders of 1/N. Divergences of this series provides a new route to the disordered phases of quantum antiferromagnets.

Keywords

RANGE ANTIFERROMAGNETIC
ANTIFERROMAGNETIC ORDER
STAGGERED MAGNETIZATION
1/N EXPANSION
APPROXIMATED
LONG RANGE
ROUTE

All Related Versions

Version 1, 1993-02-18, ArXiv
Published version: Physical Review Letters, 70 (24), 3808.

This publication has 0 references indexed in Scilit: