1. Department of Nuclear Science and Engineering and Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
2. Research Lab of Electronics (RLE), Massachusetts Institutes of Technology, Cambridge, MA 02139, USA.
3. University of Vienna, Faculty of Physics, Vienna 1090, Austria.
4. College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China.
5. Interdisciplinary Nanoscience Center (iNano), Aarhus University, Aarhus 8000, Denmark.
6. College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China.
7. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
8. Department of Physics, Escuela Politécnica Nacional, Quito 170517, Ecuador.
9. Kavli Institute for Theoretical Sciences, and CAS Center of Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100049, China.
10. Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
11. Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.