1. Institute of Nanotechnologies Electronics and Electronic Equipment Engineering, Southern Federal University, 347922 Taganrog, Russia
2. Research Laboratory of Functional Nanomaterials Technology, Southern Federal University, 347922 Taganrog, Russia
3. Core Shared Research Facility “Physics and Technology of Nanostructures”, North Ossetian State University, 362025 Vladikavkaz, Russia
4. Department of Physics, Shanghai University, 99 Shangda Road, Shanghai 200444, China