1. Chair in Hybrid Nanosystems Nanoinstitute Munich Faculty of Physics Ludwig‐Maximilians‐Universität München 80539 München Germany
2. Institute of Theoretical Solid State Physics Karlsruhe Institute of Technology 76131 Karlsruhe Germany
3. Institute of Nanotechnology Karlsruhe Institute of Technology 76021 Karlsruhe Germany
4. The Blackett Laboratory Department of Physics Imperial College London London SW7 2AZ UK