Manfra Wafer (IMAGE) Purdue University Caption Purdue professor Michael Manfra holds a gallium-arsenide wafer as he stands next to the high-mobility gallium-arsenide molecular beam epitaxy system, or MBE, at the Birck Nanotechnology Center. Manfra leads a team of Purdue researchers that create ultrapure semiconductor heterostructures to study electrons in correlated states. Credit (Purdue University photo/Andrew Hancock) Usage Restrictions For editorial use only 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.