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Theses

Bruit de charge d'une source d'électrons uniques subnanoseconde.

Abstract : This thesis is devoted to the characterization of a subnanosecond single electron source made of a quantum dot in a two dimensional electron gas. We observed the quantization of the AC current in units of 2ef, where f is the frequency of the excitation. This value of the current corresponds to the injection of a single electron and a single hole at each period of the excitation signal. The escape time of the charges is controlled by the tunable tunnel barrier between the quantum dot and the reservoir. We designed an original cryogenic high frequency noise measurement device with ultra high sensitivity and stability, which made the single electron source noise measurable. Our measurements are in very good agreement with two theoretical models that we have developed. The rst one describes the single electron source in a diusion model, and takes into account all the sample parameters. The second one is a heuristic model and gives more insight into the physics involved in the noise. We dierentiate between a shot noise regime, when the current of the source is small compared to 2ef, and a phase noise due to the quantum jittering of the emission time in the single charge emission regime. The quantitative agreement between modeling and experiment conrms the existence of a single charge emission regime for our source. This source paves the way for quantum optics like experiments with single electrons.
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Submitted on : Wednesday, December 9, 2009 - 5:01:04 PM
Last modification on : Monday, December 14, 2020 - 9:51:15 AM
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  • HAL Id : tel-00440198, version 1

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Adrien Mahé. Bruit de charge d'une source d'électrons uniques subnanoseconde.. Matière Condensée [cond-mat]. Université Pierre et Marie Curie - Paris VI, 2009. Français. ⟨tel-00440198⟩

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