1. Department of Electrical and Computer Engineering, Drexel University, Philadelphia, PA 19104, USA.
2. Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USA.
3. Department of Physics, Drexel University, Philadelphia, PA 19104, USA.
4. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninsky Prospect 59, Moscow, 117333, Russian Federation.