1. 4th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
2. Kirchhoff Institute for Physics, University of Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany
3. InnovationLab GmbH, Speyerer Straße 4, 69115 Heidelberg, Germany
4. Centre for Advanced Materials, University of Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany