Artificial molecular quantum rings: Spin density functional theory calculations
arXiv:cond-mat/0701185 · doi:10.1103/PhysRevB.74.045313
Abstract
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.
10 pages, 6 figures
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Cited by in corpus (9)
- Few-electron artificial molecules formed by laterally coupled quantum rings
- Control of the persistent currents in two interacting quantum rings through the Coulomb interaction and inter-ring tunneling
- Electron-acoustic-phonon scattering and electron relaxation in two-coupled quantum rings
- Characteristic molecular properties of one-electron double quantum rings under magnetic fields
- Isospin phases of vertically coupled double quantum rings under the influence of perpendicular magnetic fields
- Artificial molecular quantum rings under magnetic field influence
- Electron-Electron interactions, topological phase and optical properties of a charged artificial benzene ring
- Fractional Aharonov-Bohm oscillation of a two-layer ring with two electrons
- Energy spectrum and structure of one-dimensional few-electron Wigner crystals with and without coupling to light in cavity