Single wall carbon nanotube double quantum dot

Abstract

We report on two top-gate defined, coupled quantum dots in a semiconducting single wall carbon nanotube, constituting a tunable double quantum dot system. The single wall carbon nanotubes are contacted by titanium electrodes, and gated by three narrow top-gate electrodes as well as a back-gate. We show that a bias spectroscopy plot on just one of the two quantum dots can be used to extract the addition energy of both quantum dots. Furthermore, honeycomb charge stability diagrams are analyzed by an electrostatic capacitor model that includes cross capacitances, and we extract the coupling energy of the double quantum dot.

Published in Applied Physics Letters 4 December 2006. http://link.aip.org/link/?APL/89/232113

References in corpus (3)

• Molecular states in carbon nanotube double quantum dots
• Excited state spectroscopy in carbon nanotube double quantum dots
• Defining and controlling double quantum dots in single-walled carbon nanotubes

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• A triple quantum dot in a single wall carbon nanotube
• Pauli spin blockade in carbon nanotube double quantum dots
• Singlet-Triplet Physics and Shell Filling in Carbon Nanotube Double Quantum Dots
• Failure of standard approximations of the exchange coupling in nanostructures
• Nonthermal broadening in the conductance of double quantum dot structures
• Spin-polarized transport through weakly coupled double quantum dots in the Coulomb-blockade regime
• A Non-Demolition Single Spin Meter
• Entanglement and transport anomalies in nanowires