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Excited State Spectroscopy in Carbon Nanotube Double Quantum Dots

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journal contribution
posted on 12.07.2006 by Sami Sapmaz, Carola Meyer, Piotr Beliczynski, Pablo Jarillo-Herrero, Leo P. Kouwenhoven
We report on low-temperature measurements in a fully tunable carbon nanotube double quantum dot. A new fabrication technique has been used for the top-gates in order to avoid covering the whole nanotube with an oxide layer as in previous experiments. The top-gates allow us to form single dots and control the coupling between them, and we observe 4-fold shell filling. We perform inelastic transport spectroscopy via the excited states in the double quantum dot, a necessary step toward the implementation of new microwave-based experiments.