Defining and controlling double quantum dots in single-walled carbon nanotubes

Abstract

We report the experimental realization of double quantum dots in single-walled carbon nanotubes. The device consists of a nanotube with source and drain contact, and three additional top-gate electrodes in between. We show that, by energizing these top-gates, it is possible to locally gate a nanotube, to create a barrier, or to tune the chemical potential of a part of the nanotube. At low temperatures we find (for three different devices) that in certain ranges of top-gate voltages our device acts as a double quantum dot, evidenced by the typical honeycomb charge stability pattern.

9 pages, 3 figures

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• Quantum Computation with Quantum Dots
• Electron transport through double quantum dots
• Coupled quantum dots as quantum gates
• Control and Detection of Singlet-Triplet Mixing in a Random Nuclear Field
• Electric Field Control of Spin Transport
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Cited by in corpus (8)

• Nuclear magnetism and electron order in interacting one-dimensional conductors
• Gate-defined graphene double quantum dot and excited state spectroscopy
• Effects of different geometries on the conductance, shot noise and tunnel magnetoresistance of double quantum dots
• A triple quantum dot in a single wall carbon nanotube
• Spin polarized current and shot noise in carbon nanotube quantum dot in the Kondo regime
• Singlet-Triplet Physics and Shell Filling in Carbon Nanotube Double Quantum Dots
• Single wall carbon nanotube double quantum dot
• Spin-polarized transport through weakly coupled double quantum dots in the Coulomb-blockade regime