1. Department of Electrical & Computer Engineering, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
2. Department of Mechanical and Industrial Engineering, University of Illinois, Chicago, Illinois 60607, United States
3. Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, United States
4. Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States