1. Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany
2. Department of Physics, The University of Tokyo, 113-0033 Tokyo, Japan
3. Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
4. Nano Electronic Materials, University of Twente, 7522 NB Enschede, The Netherlands
5. Institute for Functional Matter and Quantum Technologies, University of Stuttgart, 70569 Stuttgart, Germany