1. 4th Physical Institute, University of Göttingen, Göttingen 37077, Germany.
2. Solid State Institute and Physics Department, Technion–Israel Institute of Technology, Haifa 32000, Israel.
3. 1st Physical Institute, University of Göttingen, Göttingen 37077, Germany.
4. Institute of Physics, University of Augsburg, Augsburg 86159, Germany.
5. International Center for Advanced Studies of Energy Conversion (ICASEC), University of Göttingen, Göttingen, Germany.