1. Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA, 19104, USA
2. Institute of Physical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
3. Discipline of Physics, Indian Institute of Technology (IIT) Gandhinagar, Palaj, Gandhinagar, Gujarat 382355, India
4. Max Planck Institute of Intelligent Systems, Heisenbergstr. 3, 70569 Stuttgart, Germany
5. Department of Physics, University of California, Merced, CA, 95343, USA
6. Department of Physics and Astronomy, Swarthmore College, Swarthmore, PA, 19081, USA