1. Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States
2. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
3. Department of Applied Physics, Stanford University, Stanford, California 94305, United States
4. Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
5. Department of Electrical Engineering
6. Department of Physics