Low-energy excitations in 2-leg and 3-leg quantum spin ladders
Condensed Matter
2009-10-30 v1 High Energy Physics - Theory
Abstract
Low-energy excitations in spin 1/2 antiferromagnetic Heisenberg spin ladders are studied by bosonization and gauge theoretical description. It is explicitly shown that zero modes in the bosonization play an essentially important role. Low-energy excitations in the 2-leg system is described by spin triplet Majorana fermions, and in the 3-leg case spin excitations on the top and bottom ladders are described by two massless scalar fields. It is predicted that if inter-ladder interaction between the top and bottom chains is introduced, a phase transition occures at some critical coupling and the system acquires an energy gap.
Keywords
Cite
@article{arxiv.cond-mat/9711202,
title = {Low-energy excitations in 2-leg and 3-leg quantum spin ladders},
author = {Ikuo Ichinose and Yasuyuki Kayama},
journal= {arXiv preprint arXiv:cond-mat/9711202},
year = {2009}
}
Comments
Latex, 26 pages