UMD Scientists (IMAGE) DOE/Brookhaven National Laboratory Caption You Zhou, UMD doctoral student Liuxin Gu, and UMD postdoctoral researcher Lifu Zhang (pictured left to right) in the UMD Department of Materials Science and Engineering observing a giant nonlinear optical response in materials that are just a few atomic layers thick. Credit Liuxin Gu Usage Restrictions OK to use with stories about this research License Original 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.