1. Department of Chemistry, Stanford University, Stanford, California 94305, United States
2. Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States
3. Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
4. Department of Applied Physics, Stanford University, Stanford, California 94305, United States
5. Department of Radiology, Stanford University, Stanford, California 94305, United States
6. Department of Electrical and Computer Engineering, University of Rochester, Rochester, New York 14627, United States
7. School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China