1. National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
2. School of Mathematics and Physics, Queen’s University, Belfast, BT7 1NN, United Kingdom
3. Department of Physics, Florida State University, Tallahassee, Florida 32306, United States
4. Department of Applied Physics and Applied Math, Columbia University, New York, New York 10027, United States