1. Université Nice Sophia Antipolis, CNRS, LPMC, UMR 7336, Parc Valrose, 06100 Nice, France; Department of Physical Sciences and Mathematics, College of Arts and Sciences, University of the Philippines Manila, Manila City 1000, Philippines; and College of Science, Pamantasan ng Lungsod ng Maynila, Intramuros, Manila City 1002, Philippines
2. Materials Science and Engineering Program, College of Science, University of the Philippines Diliman, Quezon City 1101, Philippines
3. Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
4. National Institute of Physics, College of Science, University of the Philippines Diliman, Quezon City 1101, Philippines
5. Department of Physical Sciences and Mathematics, College of Arts and Sciences, University of the Philippines Manila, Manila City 1000, Philippines and Materials Science and Engineering Program, College of Science, University of the Philippines Diliman, Quezon City 1101, Philippines
6. Université Nice Sophia Antipolis, CNRS, LPMC, UMR 7336, Parc Valrose, 06100 Nice, France