Characterization of a Differential Radio-Frequency Single-Electron Transistor

TL;DR

This paper introduces a differential RF-SET device using coupled single-electron transistors and a radio-frequency tank circuit, demonstrating its operation modes and application in measuring Coulomb staircase signals.

Contribution

It presents a novel differential RF-SET design with multiple operation modes and showcases its ability to measure Coulomb staircase signals from a Cooper-pair box.

Findings

Device operates in summing, differential, and single-SET modes

Sensitive to uncorrelated signals, screening correlated ones

Successfully measures Coulomb staircase from a Cooper-pair box

Abstract

We have fabricated and characterized a new type of electrometer that couples two parallel single-electron transistors (SETs) to a radio-frequency tank circuit for use as a differential RF-SET. We demonstrate operation of this device in summing, differential, and single-SET operation modes, and use it to measure a Coulomb staircase from a differential single Cooper-pair box. In differential mode, the device is sensitive to uncorrelated input signals while screening out correlated ones.