Artificial molecular quantum rings: Spin density functional theory calculations

Details Artificial molecular quantum rings: Spin density functional theory calculations Artificial molecular quantum rings: Spin density functional theory calculations

2007-01-09

arxiv.org/abs/cond-mat/0701185v1

Phys. Rev. B 74, 045313 (2006)

Physics

Condensed Matter

Other Condensed Matter

10 pages, 6 figures

Scientific paper

10.1103/PhysRevB.74.045313

The ground states of artificial molecules made of two vertically coupled quantum rings are studied within the spin density functional theory for systems containing up to 13 electrons. Quantum tunneling effects on the electronic structure of the coupled rings are analyzed. For small ring radius, our results recover those of coupled quantum dots. For intermediate and large ring radius, new phases are found showing the formation of new diatomic artificial ring molecules. Our results also show that the tunneling induced phase transitions in the coupled rings occur at much smaller tunneling energy as compared to those for coupled quantum dot systems.

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