1. Institute for Integrative Nanosciences, Leibniz IFW Dresden, 01069 Dresden, Germany
2. Nanophysics, Faculty of Physics, TU Dresden, 01062 Dresden, Germany
3. Departamento de Física, Universidad Católica del Norte, Avenida Angamos 0610, Casilla 1280, Antofagasta, Chile
4. Institute for Materials Science, TU Dresden, 01062 Dresden, Germany
5. Center for Materials, Architectures and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, 09126 Chemnitz, Germany
6. Material Systems for Nanoelectronics, Chemnitz University of Technology, 09107 Chemnitz, Germany