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Nat Nanotechnol. 2009 Jun;4(6):363-7. doi: 10.1038/nnano.2009.71. Epub 2009 Apr 6.

Tunable few-electron double quantum dots and Klein tunnelling in ultraclean carbon nanotubes.

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Kavli Institute of NanoScience, Delft University of Technology, Delft, The Netherlands.


Quantum dots defined in carbon nanotubes are a platform for both basic scientific studies and research into new device applications. In particular, they have unique properties that make them attractive for studying the coherent properties of single-electron spins. To perform such experiments it is necessary to confine a single electron in a quantum dot with highly tunable barriers, but disorder has prevented tunable nanotube-based quantum-dot devices from reaching the single-electron regime. Here, we use local gate voltages applied to an ultraclean suspended nanotube to confine a single electron in both a single quantum dot and, for the first time, in a tunable double quantum dot. This tunability is limited by a novel type of tunnelling that is analogous to the tunnelling in the Klein paradox of relativistic quantum mechanics.

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