Doping of a spin-1 chain: integrable model
Strongly Correlated Electrons
2009-10-31 v3
Abstract
An exactly soluble model describing a spin S=1 antiferromagnetic chain doped with mobile S=1/2 carriers is constructed. In its continuum limit the undoped state is described by three gapless Majorana fermions composing the SU(2) triplet. Doping adds to this a scalar charge field and a singlet Majorana fermion with different velocity. We argue that this mode survives when the Haldane gap is added.
Keywords
Cite
@article{arxiv.cond-mat/9803145,
title = {Doping of a spin-1 chain: integrable model},
author = {Holger Frahm and Markus P. Pfannmüller and A. M. Tsvelik},
journal= {arXiv preprint arXiv:cond-mat/9803145},
year = {2009}
}
Comments
RevTeX, 6 pages, 3 figures; final version, to appear in PRL