1. Department of Physics, University of Konstanz 1 , 78457 Konstanz, Germany
2. Department of Physics, Budapest University for Technology and Economics 2 , 1111 Budapest, Hungary
3. MTA-BME Superconducting Nanoelectronics Momentum Research Group 3 , Budapest, Hungary
4. Department of Physics, Faculty of Science, Tanta University 4 , Al-Geish St., 31527 Tanta Gharbia, Egypt
5. NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore 5 , Piazza San Silvestro 12, I-56127 Pisa, Italy
6. Electron Spectroscopy and Nanoscopy, Istituto Italiano di Tecnologia 6 , 16163 Genova, Italy
7. Department of Microtechnology and Nanoscience, Chalmers University of Technology 7 , 41296 Göteborg, Sweden
8. 8 MTA-BME Correlated Van der Waals Structures Momentum Research Group, Müegyetem rkp. 3, H-1111 Budapest, Hungary
9. Department of Physics “E. R. Caianiello,” Università degli studi di Salerno 9 , 84084 Fisciano, SA, Italy