Measuring the complex admittance of a carbon nanotube double quantum dot

S. J. Chorley; J. Wabnig; Z. V. Penfold-Fitch; K. D. Petersson; J. Frake; C. G. Smith; M. R. Buitelaar

doi:10.1103/PhysRevLett.108.036802

Measuring the complex admittance of a carbon nanotube double quantum dot

Mesoscale and Nanoscale Physics 2012-10-16 v1

Authors: S. J. Chorley , J. Wabnig , Z. V. Penfold-Fitch , K. D. Petersson , J. Frake , C. G. Smith , M. R. Buitelaar

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Abstract

We investigate radio-frequency (rf) reflectometry in a tunable carbon nanotube double quantum dot coupled to a resonant circuit. By measuring the in-phase and quadrature components of the reflected rf signal, we are able to determine the complex admittance of the double quantum dot as a function of the energies of the single-electron states. The measurements are found to be in good agreement with a theoretical model of the device in the incoherent limit. Besides being of fundamental interest, our results present an important step forward towards non-invasive charge and spin state readout in carbon nanotube quantum dots.

Keywords

carbon nanotube double quantum dot complex admittance rf reflectometry charge sensing spin readout

Cite

@article{arxiv.1109.1827,
  title  = {Measuring the complex admittance of a carbon nanotube double quantum dot},
  author = {S. J. Chorley and J. Wabnig and Z. V. Penfold-Fitch and K. D. Petersson and J. Frake and C. G. Smith and M. R. Buitelaar},
  journal= {arXiv preprint arXiv:1109.1827},
  year   = {2012}
}

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4 pages, 3 figures

Measuring the complex admittance of a carbon nanotube double quantum dot

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