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Paper detail

Fast tunnel rates in Si/SiGe one-electron single and double quantum dots

We report the fabrication and measurement of one-electron single and double quantum dots with fast tunnel rates in a Si/SiGe heterostructure. Achieving fast tunnel rates in few-electron dots can be challenging, in part due to the large electron effective mass in Si. Using charge sensing, we identify signatures of tunnel rates in and out of the dot that are fast or slow compared to the measurement rate. Such signatures provide a means to calibrate the absolute electron number and verify single electron occupation. Pulsed gate voltage measurements are used to validate the approach.

preprint2010arXivOpen access
Madhu ThalakulamC. B. SimmonsB. M. RosemeyerD. E. SavageM. G. LagallyMark FriesenS. N. CoppersmithM. A. Eriksson
cond-mat.mes-hall
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Madhu ThalakulamC. B. SimmonsB. M. RosemeyerD. E. SavageM. G. LagallyMark FriesenS. N. CoppersmithM. A. Eriksson

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