1. Nanobiophotonics and Laser Microspectroscopy Centre, Institute for
Interdisciplinary Research in Bio-Nano-Sciences, and Faculty of Physics, Babes-Bolyai University, 42 T. Laurian Street, 400271
Cluj-Napoca, Romania
2. Center
for Superconductivity, Spintronics and Surface Science, Technical University of Cluj-Napoca, 28 Memorandumului
Street, RO-400114 Cluj-Napoca, Romania