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Electronic properties of quantum dots formed by magnetic double barriers in quantum wires

By Hengyi Xu, T. Heinzel and I. V. Zozoulenko

Abstract

The transport through a quantum wire exposed to two magnetic spikes in series is modeled. We demonstrate that quantum dots can be formed this way which couple to the leads via magnetic barriers. Conceptually, all quantum dot states are accessible by transport experiments. The simulations show Breit-Wigner resonances in the closed regime, while Fano resonances appear as soon as one open transmission channel is present. The system allows to tune the dot's confinement potential from sub-parabolic to superparabolic by experimentally accessible parameters.Comment: 5 pages, 5 figure

Topics: Condensed Matter - Mesoscale and Nanoscale Physics
Year: 2011
DOI identifier: 10.1103/PhysRevB.84.035319
OAI identifier: oai:arXiv.org:1104.5640
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