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.
Cite
@article{arxiv.1105.5501,
title = {A quantized current source with mesoscopic feedback},
author = {Lukas Fricke and Frank Hohls and Niels Ubbelohde and Bernd Kaestner and Vyacheslavs Kashcheyevs and Christoph Leicht and Philipp Mirovsky and Klaus Pierz and Hans W. Schumacher and Rolf J. Haug},
journal= {arXiv preprint arXiv:1105.5501},
year = {2011}
}