Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-03-02
Phys. Rev. B73 245324 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
18 pages, 8 figures, submitted to Physical Review B
Scientific paper
10.1103/PhysRevB.73.245324
Within local-spin-density functional theory, we have investigated the `dissociation' of few-electron circular vertical semiconductor double quantum ring artificial molecules at zero magnetic field as a function of inter-ring distance. In a first step, the molecules are constituted by two identical quantum rings. When the rings are quantum mechanically strongly coupled, the electronic states are substantially delocalized, and the addition energy spectra of the artificial molecule resemble those of a single quantum ring in the few-electron limit. When the rings are quantum mechanically weakly coupled, the electronic states in the molecule are substantially localized in one ring or the other, although the rings can be electrostatically coupled. The effect of a slight mismatch introduced in the molecules from nominally identical quantum wells, or from changes in the inner radius of the constituent rings, induces localization by offsetting the energy levels in the quantum rings. This plays a crucial role in the appearance of the addition spectra as a function of coupling strength particularly in the weak coupling limit.
Barranco Manuel
Climente Juan Ignacio
Lipparini Enrico
Malet Francesc
Martí Pi Ricardo Mayol
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