Coulomb correlations and coherent charge tunneling in mesoscopic coupled rings
Abstract
We study the effect of a strong electron-electron (e-e) interaction in a system of two concentric one-dimensional rings with incommensurate areas A_1 and A_2, coupled by a tunnel amplitude. For noninteracting particles the magnetic moment (persistent current) m of the many-body ground state and first excited states is an irregular function of the external magnetic field. In contrast, we show that when strong e-e interactions are present the magnetic field dependence of m becomes periodic. In such a strongly correlated system disorder can only be caused by inter-ring charge fluctuations, controllable by a gate voltage. The oscillation period of m is proportional to 1/(A_1 + A_2) if fluctuations are suppressed. Coherent inter-ring tunneling doubles the period when charge fluctuations are allowed.
Keywords
Cite
@article{arxiv.cond-mat/9710239,
title = {Coulomb correlations and coherent charge tunneling in mesoscopic coupled rings},
author = {C. M. Canali and W. Stephan and L. Y. Gorelik and R. I. Shekhter and M. Jonson},
journal= {arXiv preprint arXiv:cond-mat/9710239},
year = {2009}
}
Comments
4 pages, 4 eps figures