1. Department
of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, United States
2. Department
of Electrical and Computer Engineering, Wayne State University, Detroit, Michigan 48202, United States
3. Department
of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996, United States
4. Materials
Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
5. Physics
and Astronomy Department, Michigan State University, East Lansing, Michigan 48824, United States