Radio frequency pulsed-gate charge spectroscopy on coupled quantum dots

Details Radio frequency pulsed-gate charge spectroscopy on coupled quantum dots Radio frequency pulsed-gate charge spectroscopy on coupled quantum dots

2010-06-29

arxiv.org/abs/1006.5554v2

Phys. Rev. B 82, 195310 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.82.195310

Time-resolved electron dynamics in coupled quantum dots is directly observed by a pulsed-gate technique. While individual gate voltages are modulated with periodic pulse trains, average charge occupations are measured with a nearby quantum point contact as detector. A key component of our setup is a sample holder optimized for broadband radio frequency applications. Our setup can detect displacements of single electrons on time scales well below a nanosecond. Tunneling rates through individual barriers and relaxation times are obtained by using a rate equation model. We demonstrate the full characterization of a tunable double quantum dot using this technique, which could also be used for coherent charge qubit control.

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