Gigahertz Single-Electron Pumping Mediated by Parasitic States.
Gigahertz Single-Electron Pumping Mediated by Parasitic States.
复制标题
由寄生态介导的千兆赫单电子泵浦。
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
G. Tettamanzi
中科院分区：
文献类型：
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作者：
A. Rossi;J. Klochan;J. Timoshenko;F. Hudson;M. Möttönen;S. Rogge;A. Dzurak;Vyacheslavs Kashcheyevs;G. Tettamanzi
在量子计量学中，半导体单电子泵用于产生精确的电流，最终目标是实现新兴的安培量子标准。基于静电定义的可调谐量子点（QD）的泵迄今为止在结合快速和准确的电荷转移方面表现出最有前途的性能。然而，在超过约1GHz的频率处，精度通常降低。最近，基于耦合到陷阱状态的QD的混合泵由于更紧密的静电约束而导致传输速率增加。在这里，我们在硅中操作的混合电子泵通过将QD耦合到多个寄生状态获得，并实现高达几千兆赫兹的鲁棒电流量化。我们表明，电子捕获的保真度取决于寄生状态成为可用于加载的序列，从而在不同的频率依赖的功能，在泵浦电流。
In quantum metrology, semiconductor single-electron pumps are used to generate accurate electric currents with the ultimate goal of implementing the emerging quantum standard of the ampere. Pumps based on electrostatically defined tunable quantum dots (QDs) have thus far shown the most promising performance in combining fast and accurate charge transfer. However, at frequencies exceeding approximately 1 GHz the accuracy typically decreases. Recently, hybrid pumps based on QDs coupled to trap states have led to increased transfer rates due to tighter electrostatic confinement. Here, we operate a hybrid electron pump in silicon obtained by coupling a QD to multiple parasitic states and achieve robust current quantization up to a few gigahertz. We show that the fidelity of the electron capture depends on the sequence in which the parasitic states become available for loading, resulting in distinctive frequency-dependent features in the pumped current.
影响因子：
38.3
作者：
Ubbelohde, Niels;Hohls, Frank;Haug, Rolf J.
通讯作者：
Haug, Rolf J.
影响因子：
8.6
作者：
Fricke, Lukas;Wulf, Michael;Schumacher, Hans W.
通讯作者：
Schumacher, Hans W.