Quantized charge pumping through a carbon nanotube double quantum dot

We demonstrate single-electron pumping in a gate-defined carbon nanotube double quantum dot. By periodic modulation of the potentials of the two quantum dots, we move the system around charge triple points and transport exactly one electron or hole per cycle. We investigate the pumping as a function...

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Bibliographic Details
Published in:Applied physics letters 2012-04, Vol.100 (14), p.143104-143104-3
Main Authors: Chorley, S. J., Frake, J., Smith, C. G., Jones, G. A. C., Buitelaar, M. R.
Format: Article
Language:English
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Summary:We demonstrate single-electron pumping in a gate-defined carbon nanotube double quantum dot. By periodic modulation of the potentials of the two quantum dots, we move the system around charge triple points and transport exactly one electron or hole per cycle. We investigate the pumping as a function of the modulation frequency and amplitude and observe good current quantization up to frequencies of 18 MHz where rectification effects cause the mechanism to break down.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3700967