1. Department of Physics, Oakland University, Rochester, Michigan 48309, USA
2. Department of Electronic and Computer Engineering, Oakland University, Rochester, Michigan 48309, USA
3. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
4. Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, USA
5. Department of Electrical and Computer Engineering, Auburn University, Auburn, Alabama 36849, USA
6. THATec Innovation GmbH, Augustaanlage 23, 68165 Mannheim, Germany
7. Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA