1. Department of Electrical Engineering, Columbia University, New York, New York 10027, United States
2. Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
3. Department of Physics
and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
4. Department
of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, United States
5. BGI-Shenzhen, Shenzhen, China
6. School
of Engineering, Brown University, Providence, Rhode Island 02912, United States
7. Department
of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States