Doped coupled frustrated spin-1/2 chains with four-spin exchange
Strongly Correlated Electrons
2009-11-07 v3
Abstract
The role of various magnetic inter-chain couplings is investigated by numerical methods in doped frustrated quantum spin chains. A non-magnetic dopant introduced in a gapped spin chain releases a free spin-1/2 soliton. The formation of a local magnetic moment is analyzed in term of soliton confinement. A four-spin coupling which might originate from cyclic exchange is shown to produce such a confinement in contrast to transverse magnetic exchange. Dopants on different chains experience an effective space-extended non-frustrating pairwise spin interaction.
Keywords
Cite
@article{arxiv.cond-mat/0211634,
title = {Doped coupled frustrated spin-1/2 chains with four-spin exchange},
author = {Nicolas Laflorencie and Didier Poilblanc},
journal= {arXiv preprint arXiv:cond-mat/0211634},
year = {2009}
}
Comments
Few modifications and references added. Submitted to PRL