Yumin Zhang is an associate professor in the Department of Physics and Engineering Physics, Southeast Missouri State University. His academic career started in China; in 1989 he obtained a master s degree in physics from Zhejiang University and then was employed as technical staff in the Institute of Semiconductors, Chinese Academy of Sciences. After receiving a PhD degree in electrical engineering from the University of Minnesota in 2000, he started to work as a faculty member at the University of Wisconsin Platteville and then at Oklahoma State University Stillwater. His research fields incl...