Numerically exact investigations of interacting spin systems provide a major tool for an understanding of their magnetic properties. For medium size systems the approximate Lanczos diagonalization is the most common method. In this article we suggest two improvements: efficient basis coding in subspaces and simple restructuring for openMP parallelization.
@article{arxiv.0706.3293,
title = {Optimized implementation of the Lanczos method for magnetic systems},
author = {J. Schnack and P. Hage and H. -J. Schmidt},
journal= {arXiv preprint arXiv:0706.3293},
year = {2008}
}