1. 4th
Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
2. Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
3. Experimental
Physics III, University of Bayreuth, Universitätsstr. 30, 95447 Bayreuth, Germany
4. Department
of Microsystems Engineering, University of Freiburg, Georges-Köhler-Allee
102, 79110 Freiburg, Germany
5. Fraunhofer Institute for Physical Measurement Techniques IPM, Heidenhofstr. 8, 79110 Freiburg, Germany