Using a quantum dot as a high-frequency shot noise detector

Details Using a quantum dot as a high-frequency shot noise detector Using a quantum dot as a high-frequency shot noise detector

2006-04-26

arxiv.org/abs/cond-mat/0604608v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.96.176601

We present the experimental realization of a Quantum Dot (QD) operating as a high-frequency noise detector. Current fluctuations produced in a nearby Quantum Point Contact (QPC) ionize the QD and induce transport through excited states. The resulting transient current through the QD represents our detector signal. We investigate its dependence on the QPC transmission and voltage bias. We observe and explain a quantum threshold feature and a saturation in the detector signal. This experimental and theoretical study is relevant in understanding the backaction of a QPC used as a charge detector.

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