1. Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
2. School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA
3. Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada
4. Network for Computational Nanotechnology, Purdue University, West Lafayette, Indiana 47907, USA
5. Department of Mechanical Engineering, University of Texas at Austin, Austin, Texas 78712, USA
6. Materials Science and Engineering Program, University of Texas at Austin, Austin, Texas 78712, USA
7. Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA
8. Purdue Quantum Center, Purdue University, West Lafayette, Indiana 47907, USA