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arXiv 1105.3570cond-mat.mes-hall
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少电子双量子点能级的确定

Determination of energy scales in few-electron double quantum dots

D. Taubert, D. Schuh, W. Wegscheider, S. Ludwig

摘要:

栅极限定的量子点和它们的栅极之间的电容耦合作为所施加的栅极电压的函数而显著变化。栅极电压和相关能量尺度之间的转换通常在相当对称的点-引线隧道耦合的制度中进行,该耦合足够强以允许直接的输运测量。不幸的是,这个标准过程对于弱的和可能不对称的隧道耦合失败,在现实设备中通常是这种情况。我们已经开发出的方法来确定栅极电压的能量转换准确地在不同的制度的点,铅隧道耦合,并表现出强烈的变化的转换因子。我们的概念可以很容易地扩展到三重量子点甚至更大的阵列。

英文摘要:

The capacitive couplings between gate-defined quantum dots and their gates vary considerably as a function of applied gate voltages. The conversion between gate voltages and the relevant energy scales is usually performed in a regime of rather symmetric dot-lead tunnel couplings strong enough to allow direct transport measurements. Unfortunately this standard procedure fails for weak and possibly asymmetric tunnel couplings, often the case in realistic devices. We have developed methods to determine the gate voltage to energy conversion accurately in the different regimes of dot-lead tunnel couplings and demonstrate strong variations of the conversion factors. Our concepts can easily be extended to triple quantum dots or even larger arrays.

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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