1. Department of Experimental Physics, Wrocław University of Science and Technology, St. Wyspiańskiego 27, 50-370 Wrocław, Poland
2. Institute of Theoretical Physics, Wrocław University of Science and Technology, St. Wyspiańskiego 27, 50-370 Wrocław, Poland
3. Łukasiewicz Research Network─PORT Polish Center for Technology Development, Stabłowicka 147, 54-066 Wrocław, Poland
4. Technological Physics, Institute of Nanostructure Technologies and Analytics, CINSaT, University of Kassel, 34132 Kassel, Germany
5. Electrical and Computer Engineering Department and Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, Haifa 32000, Israel