1. Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27265, United States
2. School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, United States
3. Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, New York 14853, United States
4. National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
5. Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, United States
6. Donostia International Physics Center, 20018 Donostia-San Sebastian, Spain
7. ISC−CNR and Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 2, 00185 Rome, Italy