Coulomb correlations and coherent charge tunneling in mesoscopic coupled rings

Details Coulomb correlations and coherent charge tunneling in mesoscopic coupled rings Coulomb correlations and coherent charge tunneling in mesoscopic coupled rings

1997-10-22

arxiv.org/abs/cond-mat/9710239v1

Europhys. Lett. 40, 67 (1997)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 eps figures

Scientific paper

10.1209/epl/i1997-00425-9

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.

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