Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-07-14
Nature Nanotechnology 4, 363 - 367 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
21 pages including supplementary information
Scientific paper
10.1038/nnano.2009.71
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 until now prevented tunable nanotube-based quantum-dot devices from reaching the single-electron regime. Here, we use local gate voltages applied to an ultra-clean 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 that in the Klein paradox of relativistic quantum mechanics.
Gotz Gerhard
Kouwenhoven Leo P.
Steele Gary A.
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