1. Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA
2. Department of Material Science and Engineering, The Ohio State University, Columbus, Ohio 43210, USA
3. Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland 20723, USA
4. Lawrence Livermore National Laboratory, Livermore, California 94550, USA
5. Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045, USA
6. Seurat Technologies, Wilmington, Massachusetts 01887, USA
7. Department of Electrical and Computer Engineering, The Ohio State University, Columbus, Ohio 43210, USA