1. Department of Physics, The Ohio State University, Columbus, Ohio 43221, United States
2. National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
3. Department of Physics, Florida State University, Tallahassee, Florida 32306, United States
4. School of Physics, Beijing Institute of Technology, 100081 Beijing, China
5. Department of Physics, The University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080-3021, United States
6. Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
7. Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan