Laterally coupled few-electron quantum dots

Details Laterally coupled few-electron quantum dots Laterally coupled few-electron quantum dots

2000-04-13

arxiv.org/abs/cond-mat/0004209v1

Physics

Condensed Matter

13 pages, 9 figures on 2 pages

Scientific paper

10.1103/PhysRevB.62.2605

We present ground-state calculations for laterally coupled quantum dots containing 2, 4, and 8 electrons. As our emphasis is on spin effects our results are obtained by applying spin-density functional theory (SDFT). By varying the distance between the centers of the coupled quantum dots, the transition from weak to strong coupling situation is realized. For the 2-electron system we also apply the Heitler-London approximation and analytical concepts to check the reliability of SDFT calculations in this case. In addition we discuss the features of the Coulomb staircase of laterally coupled quantum dots in the weak and strong coupling regimes in comparison to that of a circular parabolic quantum dot.

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