1. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, United States
2. Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, United States
3. School of Materials Engineering, Purdue University, West Lafayette, Indiana 47906, United States
4. Department of Mechanical and Industrial Engineering, University of Illinois, Chicago, Illinois 60607, United States
5. Department of Electrical and Computer Engineering, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08901, United States