Abstract
The electronic states of an array of Nd quantum dots (QDs) patterned in an isolated quantum ring are calculated. An external magnetic field B perpendicular to the ring’s plane is considered. The single particle spectra show the presence of an insulating pseudoband which can be totally filled by 2Nd electrons. A large gap is present between the insulating pseudoband and the metallic one. The damping of Aharonov–Bohm oscillations reflects the localization of the quantum states and can be justified in terms of metallic-insulating transition induced by the barriers. The energy spectra of low-lying states of Ne≤2Nd interacting electrons in the QDs array as a function of B are obtained. Phase diagrams are presented for the insulating band from half to integer filling. The diagrams indicate a rich variety of ground states revealing transitions in which the total spin changes.
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