1. Irvine Materials Research Institute ( , Irvine, CA , United States
2. IMRI), University of California ( , Irvine, CA , United States
3. JEOL USA, Inc , Peabody, MA , United States
4. Department of Materials Science and Engineering, University of California , Irvine, CA , United States
5. Department of Physics and Astronomy, University of California , Irvine, CA , United States