Spin Coherent-State Path Integrals and the Instanton Calculus
Condensed Matter
2007-05-23 v1 Quantum Physics
Abstract
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.
Keywords
Cite
@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}
}
Comments
32 Pages, RevTex. No figures