Non-perturbative saddle point for the effective action of disordered and interacting electrons in 2D
Disordered Systems and Neural Networks
2009-10-31 v1
Abstract
We find a non-perturbative saddle-point solution for the non-linear sigma model proposed by Finkelstein for interacting and disordered electronic systems. Spin rotation symmetry, present in the original saddle point solution, is spontaneously broken at one-loop, as in the Coleman-Weinberg mechanism. The new solution is singular in both the disorder and triplet interaction strengths, and it also explicitly demonstrates that a non-trivial ferromagnetic state appears in a theory where the disorder average is carried out from the outset.
Keywords
Cite
@article{arxiv.cond-mat/0006285,
title = {Non-perturbative saddle point for the effective action of disordered and interacting electrons in 2D},
author = {Claudio Chamon and Eduardo R. Mucciolo},
journal= {arXiv preprint arXiv:cond-mat/0006285},
year = {2009}
}
Comments
4 pages, 1 figure