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arXiv · 1105.5501

A quantized current source with mesoscopic feedback

Lukas Fricke·Frank Hohls·Niels Ubbelohde·Bernd Kaestner·Vyacheslavs Kashcheyevs·Christoph Leicht·Philipp Mirovsky·Klaus Pierz·Hans W. Schumacher·Rolf J. Haug
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Abstract

We study a mesoscopic circuit of two quantized current sources, realized by non-adiabatic 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.

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Lukas Fricke, Frank Hohls, Niels Ubbelohde, Bernd Kaestner, Vyacheslavs Kashcheyevs, Christoph Leicht, Philipp Mirovsky, Klaus Pierz, Hans W. Schumacher, Rolf J. Haug. 2011-05-27. A quantized current source with mesoscopic feedback. https://doi.org/10.1103/physrevb.83.193306

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