1. 3rd Institute of Physics, IQST, and Research Centre Scope, University of Stuttgart, Stuttgart 70569, Germany
2. Materials Research and Technology (MRT) Department, Luxembourg Institute of Science and Technology, Belvaux 4362, Luxembourg
3. Department of Physics and Materials Science, University of Luxembourg, Belvaux 4362, Luxembourg
4. Solid State Nanophysics, Max Planck Institute for Solid State Research, Stuttgart 70569, Germany
5. Department of Physics, Chemistry and Biology, Linköping University, Linköping 581 83, Sweden
6. Wigner Research Centre for Physics, Budapest 1121, Hungary
7. Institute of Physics, Department of Atomic Physics, Budapest University of Technology and Economics, Budapest 1117, Hungary
8. MTA-WFK Lendület “Momentum” Semiconductor Nanostructures Research Group, Budapest 1525, Hungary
9. Max Planck Institute for Solid State Research, Stuttgart 70569, Germany