Non-Abelian Bosonization and Haldane's Conjecture

Preprint

3 February 1998

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.hep-th/9802014

Abstract

We study the long wavelength limit of a spin S Heisenberg antiferromagnetic chain. The fermionic Lagrangian obtained corresponds to a perturbed level 2S SU(2) Wess-Zumino-Witten model. This effective theory is then mapped into a compact U(1) boson interacting with Z_{2S} parafermions. The analysis of this effective theory allows us to show that when S is an integer there is a mass gap to all excitations, whereas this gap vanishes in the half-odd-integer spin case. This gives a field theory treatment of the so-called Haldane's conjecture for arbitrary values of the spin S.

Keywords

HALDANE'S CONJECTURE
ABELIAN BOSONIZATION
ANTIFERROMAGNETIC
WAVELENGTH LIMIT
LONG WAVELENGTH
BOSON

All Related Versions

Version 1, 1998-02-03, ArXiv
Published version: Physical Review B, 58 (1), 65.

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