Single electron pumping through a quantum dot-embedded carbon nanotube using surface acoustic wave

摘要

We have studied acoustoelectric current through a quantum dot-embedded carbon nanotube induced by a surface acoustic wave. The measurements were carried out on a same device but in two very different quantum dot charging energy E_c regimes (～50 and ～5 meV). The results showed dramatic differences in induced acoustoelectric current depending on E_c The induced acoustoelectric current showed a polarity reversal around the Coulomb blockade peak when E_c is small (5 meV). For a large E_c (50 meV), however, a current plateau was observed as a function of surface acoustic wave powers as well as gate voltages.