1. Advanced
Materials Laboratory, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
2. Air Force Research Laboratory, Sensors Directorate, Wright-Patterson AFB, Ohio 45433, United States
3. Air Force Research Laboratory, Materials & Manufacturing Directorate, Wright-Patterson AFB, Ohio 45433, United States
4. Department
of Physics and Center of Theoretical and Computational Physics, University of Hong Kong, Hong Kong, China