1. Electrical and Computer Engineering New York University Brooklyn NY 11201 USA
2. Center for Functional Nanomaterials Brookhaven National Laboratory Upton NY 11973 USA
3. International Center for Materials Nanoarchitectonics National Institute of Materials Science 1‐1 Namiki Tsukuba Ibaraki 305‐0044 Japan
4. Research Center for Functional Materials National Institute of Materials Science 1‐1 Namiki Tsukuba Ibaraki 305‐0044 Japan
5. Center for Quantum Phenomena Physics Department New York University New York NY 10003 USA