1. Department of Physics and Center for Complex Quantum Systems, The University of Texas at Austin, Austin, Texas 78712, United States
2. Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2050, United States
3. Department of Physics, Chalmers University of Technology, 41296 Gothenburg, Sweden
4. Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
5. International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
6. Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
7. Department of Chemistry, Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan
8. Department of Physics, Philipps University of Marburg, 35037 Marburg, Germany