Quantized current source with mesoscopic feedback
Quantized current source with mesoscopic feedback
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DOI：
10.1103/physrevb.83.193306
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发表时间：
2011-05-26
影响因子：
3.7
通讯作者：
Haug, Rolf J.
中科院分区：
文献类型：
--
作者：
Fricke, Lukas;Hohls, Frank;Haug, Rolf J.
我们研究了一种由两个量子化电流源组成的介观电路，该电路由非绝热的单电子泵串联而成，中间有一个微米大小的小岛。我们发现，由于介观孤岛的带电，通过第二个泵浦的量子输运可以通过反馈锁定在第一个泵浦的量子化电流上。使用附近的电荷探测器对岛上的电荷变化进行了测量，证实了这一点。最后，电荷反馈信号清楚地证明了在单电子泵浦操作过程中，动态量子点的激发态被加载。
We study a mesoscopic circuit of two quantized current sources, realized by nonadiabatic single-electron pumps connected in series with a small micron-sized island in between. We find that quantum transport through the second pump can be locked onto the quantized current of the first one by a feedback due to charging of the mesoscopic island. This is confirmed by a measurement of the charge variation on the island using a nearby charge detector. Finally, the charge feedback signal clearly evidences loading into excited states of the dynamic quantum dot during single-electron pump operation.