Sai Bai and Zhongcheng Yuan (IMAGE) Linköping University Caption Sai Bai, Research fellow, and Zhongcheng Yuan, PhD student at the Department of Physics, Chemistry and Biology, IFM, at Linkoping University. Credit Charlotte Perhammar Usage Restrictions In connection with news from LiU 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.