1. Material Systems for Nanoelectronics, Technische Universität Chemnitz, 09107 Chemnitz, Germany
2. Department of Mechanical Engineering, University of Houston, Houston, Texas 77204, United States
3. E. Pokatilov Laboratory of Physics and
Engineering of Nanomaterials, Department of Physics and Engineering, Moldova State University, Chisinau, MD-2009, Republic of Moldova