Exchange energy and stability diagram of few-electron coupled elongated quantum dots

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dc.creatorZhang, L. -X.
dc.creatorMelnikov, D. V.
dc.creatorLeburton, J. -P.
dc.date2008-08-24
dc.date.accessioned2026-07-07T09:58:12Z
dc.date.available2026-07-07T09:58:12Z
dc.descriptionWe study the properties of a few-electron system confined in coupled elongated quantum dots (QDs) using a model Gaussian potential and the numerical exact diagonalization technique. In the absence of magnetic fields, as the aspect ratio $r$ between the QD extensions in the direction perpendicular and parallel to the coupling directions increases, the exchange energy exhibits a sharp variation at the specific value $r=3.9$, before (after) which the exchange energy increases (declines). The sharp variation occurs because of a sudden change in the single-particle configuration of the triplet state. The stability region with one electron in each of the QDs is found to shrink, and finally vanishes as it becomes progressively easier to localize both electrons into the lower QD. For $r>3.9$, the first singlet-triplet transition shifts to a small magnetic fields.
dc.description7 figures
dc.identifierhttps://arxiv.org/abs/0808.3261
dc.identifierhttp://arxiv.org/abs/0808.3261
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/167628
dc.subjectMesoscale and Nanoscale Physics
dc.subjectSuperconductivity
dc.titleExchange energy and stability diagram of few-electron coupled elongated quantum dots
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