1. Material Systems for Nanoelectronics, Technische Universität Chemnitz, 09126 Chemnitz, Germany
2. Institut für Experimentelle Physik, TU Bergakademie Freiberg, Leipziger Straße 23, 09596 Freiberg, Germany
3. Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
4. Institute for Integrative Nanosciences, IFW Dresden, 01069 Dresden, Germany