We present a full fledged quantum mechanical treatment of the interplay between the charge and the spin zero-mode interactions in quantum dots. Quantum fluctuations of the spin-mode suppress the Coulomb blockade and give rise to non-monotonic behavior near this point. They also greatly enhance the dynamic spin susceptibility. Transverse fluctuations become important as one approaches the Stoner instability. The non-perturbative effects of zero-mode interaction are described in terms of charge (U(1)) and spin (SU(2)) gauge bosons.
@article{arxiv.cond-mat/0504751,
title = {The Interplay of Spin and Charge Channels in Zero Dimensional Systems},
author = {M. N. Kiselev and Yuval Gefen},
journal= {arXiv preprint arXiv:cond-mat/0504751},
year = {2007}
}