Shot Noise Detection on a Carbon Nanotube Quantum Dot

E. Onac, F. Balestro, B. Trauzettel, C. F. J. Lodewijk, L. P. Kouwenhoven

Published 2005-10-27Version 1

An on-chip detection scheme for high frequency signals is used to detect noise generated by a quantum dot formed in a single wall carbon nanotube. The noise detection is based on photon assisted tunneling in a superconductor-insulator-superconductor junction. Measurements of shot noise over a full Coulomb diamond are reported with excited states and inelastic cotunneling clearly resolved. Super-Poissonian noise is detected in the case of inelastic cotunneling.