1. Department of Applied Physics, Uzhhorod National University, Uzhhorod, Ukraine
2. Institute of Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
3. Department of Applied Physics & Advanced Mathematics, National University of Technologies and Design, Kyiv, Ukraine
4. Department of General & Solid-State Physics, National Technical University of Ukraine “Igor Sikorsky Polytechnic University”, Kyiv, Ukraine
5. Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovakia