Spin Coherent-State Path Integrals and the Instanton Calculus
凝聚态物理
2007-05-23 v1 量子物理
摘要
We use an instanton approximation to the continuous-time spin coherent-state path integral to obtain the tunnel splitting of classically degenerate ground states. We show that provided the fluctuation determinant is carefully evaluated, the path integral expression is accurate to order O(1/j). We apply the method to the LMG model and to the molecular magnet Fe_8 in a transverse field.
引用
@article{arxiv.cond-mat/0111139,
title = {Spin Coherent-State Path Integrals and the Instanton Calculus},
author = {Anupam Garg and Evgueny Kochetov and Kee-Su Park and Michael Stone},
journal= {arXiv preprint arXiv:cond-mat/0111139},
year = {2007}
}
备注
32 Pages, RevTex. No figures