Optimized implementation of the Lanczos method for magnetic systems
arXiv:0706.3293 · doi:10.1016/j.jcp.2008.01.027
Abstract
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.
9 pages, 2 figues, submitted to Journal of Computational Physics