1. MESA Fabrication Facility, Sandia National Laboratories 1 , Albuquerque, New Mexico 87185, USA
2. Department of Electrical Engineering and Computer Science, Oregon State University 2 , Corvallis, Oregon 97331, USA
3. Department of Materials Science and Engineering, University of Virginia 3 , Charlottesville, Virginia 22904, USA
4. Charles L. Brown Department of Electrical and Computer Engineering, University of Virginia 4 , Charlottesville, Virginia 22904, USA