Si/SiGe quantum dot with superconducting single-electron transistor charge sensor

Details Si/SiGe quantum dot with superconducting single-electron transistor charge sensor Si/SiGe quantum dot with superconducting single-electron transistor charge sensor

2011-02-22

arxiv.org/abs/1102.4544v1

Appl. Phys. Lett. 98, 142104 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1063/1.3572033

We report a robust process for fabrication of surface-gated Si/SiGe quantum dots (QDs) with an integrated superconducting single-electron transistor (S-SET) charge sensor. A combination of a deep mesa etch and AlOx backfill is used to reduce gate leakage. After the leakage current is suppressed, Coulomb oscillations of the QD and the current-voltage characteristics of the S-SET are observed at a temperature of 0.3 K. Coupling of the S-SET to the QD is confirmed by using the S-SET to perform sensing of the QD charge state.

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