Exact models for trimerization and tetramerization in spin chains
Strongly Correlated Electrons
2009-11-13 v1
Abstract
We present exact models for an antiferromagnetic S=1 spin chain describing trimerization as well as for an antiferromagnetic S=3/2 spin chain describing tetramerization. These models can be seen as generalizations of the Majumdar-Ghosh model. For both models, we provide a local Hamiltonian and its exact three- or four-fold degenerate ground state wavefunctions, respectively. We numerically confirm the validity of both models using exact diagonalization and discuss the low lying excitations.
Keywords
Cite
@article{arxiv.0809.2003,
title = {Exact models for trimerization and tetramerization in spin chains},
author = {Stephan Rachel and Martin Greiter},
journal= {arXiv preprint arXiv:0809.2003},
year = {2009}
}
Comments
7 pages, 8 figures