Device Used in the Study (IMAGE) University of Groningen Caption The multi-layered device used in the study. WS2: tungsten disulfide, hBN: boron nitride layer Credit S. Omar, University of Groningen Usage Restrictions With credit 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.