1. 4th Physics Institute and Research Center SCoPE, University of Stuttgart, 70569 Stuttgart, Germany
2. 1st Physics Institute and Research Center SCoPE, University of Stuttgart, 70569 Stuttgart, Germany
3. Institute of Micro- and Nanoelectronic Systems, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
4. Max Planck Institute for Intelligent Systems, 70589 Stuttgart, Germany