A triple quantum dot in a single-wall carbon nanotube

Nano Lett. 2008 Apr;8(4):1055-60. doi: 10.1021/nl072948y. Epub 2008 Mar 4.

Abstract

A top-gated single-wall carbon nanotube is used to define three coupled quantum dots in series between two electrodes. The additional electron number on each quantum dot is controlled by top-gate voltages allowing for current measurements of single, double, and triple quantum dot stability diagrams. Simulations using a capacitor model including tunnel coupling between neighboring dots captures the observed behavior with good agreement. Furthermore, anticrossings between indirectly coupled levels and higher order cotunneling are discussed.