Illustration of Single-Electron (IMAGE) VTT Technical Research Centre of Finland Caption Illustration of single-electron tunnelling through an oxide tunnel barrier in the primary thermometer device. The measured tunnel current is used in determining the absolute electron temperature. Credit VTT Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.