Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Superconductivity: Poster Session

TT 19.47: Poster

Montag, 7. März 2016, 15:00–18:00, Poster D

Development of RF-SETs for error detection in single electron pumps — •David Reifert, Niels Ubbelohde, Ralf Dolata, Thomas Weimann, and Alexander Zorin — Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig. Germany

Semiconductor single electron pumps allow the controlled transport of electrons with a frequency f (about 1 GHz) which results in a current (I=e× f) in the range of about 0.1 nA. However, since the pumping mechanism is prone to errors due to the stochastic nature of the transport mechanism, the accuracy of these devices is limited (0.2 ppm at the moment). We developed a method to detect and account the errors of these pumps. To realize this error detection we integrate several electron pumps in a serial circuit with intermediate charge nodes between them, so the pumping errors can be detected by monitoring the charge of the nodes. As ultra-sensitive charge detectors we used superconducting Al single electron transistors (SETs) capacitively coupled to the intermediate nodes. To increase the readout bandwidth of the SET and, therefore detect errors at relatively high rate, we put the SETs in resonant tank circuits and measured the reflectance from these resonators. With such an integrated device we can achieve a significant improvement in accuracy. The measurement setup and the progress of counting measurements with such a RF-SET will be reported.