1. College of Physics and Optoelectronic Engineering, Shenzhen University, 518060 Shenzhen, P. R. China
2. Physics Department, Taras Shevchenko National University of Kyiv, 01601 Kyiv, Ukraine
3. Technology Innovation Institute, 9639 Masdar City, Abu Dhabi, United Arab Emirates
4. Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
5. Horiba Scientific, 91120 Palaiseau, France
6. V.M. Glushkov Institute of Cybernetics, National Academy of Sciences, 03187 Kyiv, Ukraine
7. Institute of Materials for Electronics and Magnetism, IMEM-CNR, I-43124 Parma, Italy