1. Institute of Nanotechnology (INT) Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
2. Karlsruhe Nano Micro Facility (KNMF) Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
3. Institute of Physical Chemistry (IPC) Karlsruhe Institute of Technology (KIT) Fritz-Haber Weg 2, G 30.44 76131 Karlsruhe Germany
4. Institute of Quantum Materials and Technologies (IQMT) Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
5. Centre Européen de Sciences Quantiques (CESQ) in the Institut de Science et d'Ingénierie Supramoléculaires (ISIS) 8 allée Gaspard Monge, BP 70028, 67083 Strasbourg Cedex France