Local Gate Control of a Carbon Nanotube Double Quantum Dot
Harvard University Cambridge United States
Pagination or Media Count:
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 electroninteractions in the quantum regime in a molecular conductor is important for applications such as quantum computation.