Charge sensing in enhancement mode double-top-gated metal-oxide-semiconductor quantum dots
Appl. Phys. Lett. 95, 202102 (2009); doi:10.1063/1.3259416
Published 17 November 2009
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Laterally coupled charge sensing of quantum dots is highly desirable because it enables measurement even when conduction through the quantum dot itself is suppressed. In this work, we demonstrate such charge sensing in a double-top-gated metal-oxide-semiconductor system. The current through a point contact constriction integrated near a quantum dot shows sharp 2% changes corresponding to charge transitions between the dot and a nearby lead. We extract the coupling capacitance between the charge sensor and the quantum dot, and we show that it agrees well with a three-dimensional capacitance model of the integrated sensor and quantum dot system.
©2009 American Institute of Physics
| History: | Received 18 September 2009; accepted 14 October 2009; published 17 November 2009 |
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