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arXiv · 0807.1881

Time-resolved detection of single-electron interference

S. Gustavsson·R. Leturcq·M. Studer·T. Ihn·K. Ensslin·D. C. Driscoll·A. C. Gossard
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Abstract

We demonstrate real-time detection of self-interfering electrons in a double quantum dot embedded in an Aharonov-Bohm interferometer, with visibility approaching unity. We use a quantum point contact as a charge detector to perform time-resolved measurements of single-electron tunneling. With increased bias voltage, the quantum point contact exerts a back-action on the interferometer leading to decoherence. We attribute this to emission of radiation from the quantum point contact, which drives non-coherent electronic transitions in the quantum dots.

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S. Gustavsson, R. Leturcq, M. Studer, T. Ihn, K. Ensslin, D. C. Driscoll, A. C. Gossard. 2008-07-11. Time-resolved detection of single-electron interference. https://doi.org/10.1021/nl801689t

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