1. Department of Physics, Indian Institute of Science, Bangalore 560012, India
2. Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel
3. Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India
4. Institute of Physics, Johannes Gutenberg Universität, Staudinger Weg 7, 55128 Mainz, Germany
5. Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel
6. Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
7. International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan