1. Michigan Technological
University, Houghton, Michigan 49931, United States
2. South China
Agricultural
University, Guangzhou 510642, China
3. Department
of Physics and Astronomy, Valparaiso University, Valparaiso, Indiana 46383, United States
4. Weapons
and Materials Research Directorate, ATTN: RDRL-WM, US Army Research Laboratory, Aberdeen
Proving Ground, Maryland 21005-5069, United States