2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/108384We 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, control the coupling between them and we observe four-fold shell filling. We perform inelastic transport spectroscopy via the excited states in the double quantum dot, a necessary step towards the implementation of new microwave-based experiments.16 pages, 6 figures, submitted to nanolettersMesoscale and Nanoscale Physicstext