Charge Detection in Phosphorus-doped Silicon Double Quantum Dots

Details Charge Detection in Phosphorus-doped Silicon Double Quantum Dots Charge Detection in Phosphorus-doped Silicon Double Quantum Dots

2010-08-09

arxiv.org/abs/1008.1486v1

Applied Physics Letters 97, 223506 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

We report charge detection in degenerately phosphorus-doped silicon double quantum dots (DQD) electrically connected to an electron reservoir. The sensing device is a single electron transistor (SET) patterned in close proximity to the DQD. Measurements performed at 4.2K show step-like behaviour and shifts of the Coulomb Blockade oscillations in the detector's current as the reservoir's potential is swept. By means of a classical capacitance model, we demonstrate that the observed features can be used to detect single-electron tunnelling from, to and within the DQD, as well as to reveal the DQD charge occupancy.

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