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arXiv 0810.0672cond-mat.mes-hall
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量子点输运光谱中的背景电荷和量子效应

Background charges and quantum effects in quantum dots transport spectroscopy

M. Pierre, M. Hofheinz, X. Jehl, M. Sanquer, G. Molas, M. Vinet, S. Deleonibus

摘要:

我们扩展了一个简单的模型耦合到一个单电子盒的电荷陷阱的能量范围和参数,使它提供了新的见解和预测容易观察到在许多实验系统。我们发现,一个单一的背景电荷是足够的,使线的微分电导的稳定图中的量子点,即使在未扭曲的库仑钻石。它还抑制了杂质电荷简并附近的电流,并产生远离该简并的负微分线。我们比较这张照片的钻石线,分别基于量子点的激发光谱和波动的状态密度的联系的其他两个公认的解释。为了区分这些模型,我们强调与环境电荷陷阱有关的具体功能。最后,我们表明,我们的模型帐户非常好的硅纳米线量子点中观察到的所有异常功能。

英文摘要:

We extend a simple model of a charge trap coupled to a single-electron box to energy ranges and parameters such that it gives new insights and predictions readily observable in many experimental systems. We show that a single background charge is enough to give lines of differential conductance in the stability diagram of the quantum dot, even within undistorted Coulomb diamonds. It also suppresses the current near degeneracy of the impurity charge, and yields negative differential lines far from this degeneracy. We compare this picture to two other accepted explanations for lines in diamonds, based respectively on the excitation spectrum of a quantum dot and on fluctuations of the density-of-states in the contacts. In order to discriminate between these models we emphasize the specific features related to environmental charge traps. Finally we show that our model accounts very well for all the anomalous features observed in silicon nanowire quantum dots.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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