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Size effects in the exchange coupling between two electrons confined in quantum wire quantum dots

机译:限制在量子线量子点中的两个电子之间的交换耦合中的尺寸效应

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We theoretically investigate the properties of a two-electron system confined in the three-dimensional potential of coupled quantum dots formed in a quantum wire. For this purpose, we implement a variational Heitler-London method that minimizes the system energies with respect to variational parameters in electron trial wave functions. We find that tunnel and exchange couplings rapidly decay with increasing interdot distance and interdot barrier height. In the quasi-one-dimensional limit achieved by reducing the wire diameter, we find that the overlap between the dots decreases, which results in a drop in the exchange coupling. We also discuss the validity of our variational Heitler-London method with respect to the model potential parameters; we find good agreement between our results and available experimental data.
机译:我们从理论上研究了一种双电子系统的性质,该系统局限于量子线中形成的耦合量子点的三维电位。为此目的,我们实现了变分海特勒-伦敦方法,该方法相对于电子试验波函数中的变分参数将系统能量最小化。我们发现,隧道和交换耦合随着点间距和点势垒高度的增加而迅速衰减。在通过减小导线直径实现的准一维极限中,我们发现点之间的重叠减少了,这导致交换耦合下降。我们还讨论了关于模型潜在参数的变分Heitler-London方法的有效性。我们发现我们的结果与可用的实验数据之间有很好的一致性。

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