We study localization and delocalization in a class of non-hermitean Hamiltonians inspired by the problem of vortex pinning in superconductors. We show how to take into account multiple scattering. We also obtain some bounds on the complex energy spectrum.
@article{arxiv.cond-mat/9708029,
title = {Non-Hermitean De-Localization: Multiple Scattering and Bounds},
author = {E. Brezin and A. Zee},
journal= {arXiv preprint arXiv:cond-mat/9708029},
year = {2009}
}