1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
2. Department of Physics, Faculty of Science, National University of Singapore, 117542, Singapore
3. Department of Physics, Tohoku University, Sendai, Miyagi 9808578, Japan
4. Francis Bitter Magnet Laboratory
5. Department of Electrical Engineering and Computer Science
6. Department of Physics