1. Department of Physics, University of Central Florida, Orlando, Florida 32816, USA
2. Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, USA
3. Material Science and Engineering, University of Florida, Gainesville, Florida 32611, USA
4. Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel
5. School of Electrical Engineering, Tel Aviv University, Tel Aviv 69978, Israel
6. Skolkovo Institute of Science and Technology, Ctr Design, Manufacturing & Mat, Nobel St, Bldg 1, Moscow 121205, Russia
7. Department of Physics, University of North Texas, Denton, Texas 76203, USA