1. Department of Physics, University of California at Berkeley, Berkeley, CA 94720, USA.
2. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
3. Kavli Energy NanoSciences Institute at the University of California, Berkeley and the Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
4. Department of Materials Science and Engineering, University of California at Berkeley, Berkeley, CA 94720, USA.
5. Department of Physics, University of Seoul, Seoul, South Korea.
6. Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
7. Collaborative Innovation Center of Quantum Matter, Beijing, China.
8. Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
9. International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
10. Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.