1. European Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland
2. Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany
3. Chair Materials for Electrical Engineering and Electronics, Institute of Materials Science and Engineering, Institute of Micro and Nanotechnologies MacroNano®, TU Ilmenau, Gustav-Kirchhoff-Strasse 5, 98693 Ilmenau, Germany
4. Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany