1. E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305, United States
2. Department of Physics, Stanford University, Stanford, California 94305, United States
3. Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, United States
4. Department of Applied Physics, Stanford University, Stanford, California 94305, United States
5. Stanford Institute for Materials and Energy Sciences, SLAC National
Accelerator Laboratory, Menlo Park, California 94025, United States
6. Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States