Real Time Electron Tunneling and Pulse Spectroscopy in Carbon Nanotube Quantum Dots

TL;DR

This paper explores real-time electron tunneling and pulse spectroscopy in a carbon nanotube quantum dot, achieving precise control and measurement of tunnel rates and excitation spectra in a nearly isolated regime.

Contribution

It demonstrates the use of an aluminum SET as a charge detector to measure and tune tunnel rates and excitation spectra in a carbon nanotube quantum dot.

Findings

Tunnel rates tuned between 1 kHz and 1 Hz

Successful real-time charge detection of the QD

Measured excitation spectrum of the isolated QD

Abstract

We investigate a Quantum Dot (QD) in a Carbon Nanotube (CNT) in the regime where the QD is nearly isolated from the leads. An aluminum single electron transistor (SET) serves as a charge detector for the QD. We precisely measure and tune the tunnel rates into the QD in the range between 1 kHz and 1 Hz, using both pulse spectroscopy and real - time charge detection and measure the excitation spectrum of the isolated QD.