1. Material Systems for Nanoelectronics, Chemnitz University of Technology, Chemnitz 09126, Germany
2. Institute for Integrative Nanosciences, IFW
Dresden, Helmholtzstraße 20, Dresden 01069, Germany
3. Institute for Complex Materials, IFW Dresden,
Helmholtzstraße 20, Dresden 01069, Germany
4. Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 510119, 01314
Dresden, Germany