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ReportsLocal Gate Control of a Carbon Nanotube Double Quantum Dot
We have measured carbon nanotube quantum dots with multiple electrostatic gates and used the resulting enhanced control to investigate a nanotube double quantum dot. Transport measurements reveal honeycomb charge stability diagrams as a function of two nearly independent gate voltages. The device can be tuned from weak to strong interdot tunnel-coupling regimes, and the transparency of the leads can be controlled independently. We extract values of energy-level spacings, capacitances, and interaction energies for this system. This ability to control electron interactions in the quantum regime in a molecular conductor is important for applications such as quantum computation. Department of Physics, Harvard University Cambridge, MA 02138, USA.
* These authors contributed equally to this work.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
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