1. 5. Physikalisches Institut and Center for Integrated Quantum Science and Technology (IQST), Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
2. Institut für Großflächige Mikroelektronik and IQST, Universität Stuttgart, Allmandring 3b, 70569 Stuttgart, Germany
3. Institute of Smart Sensors and IQST, Universität Stuttgart, Pfaffenwaldring 47, 70569 Stuttgart, Germany
4. Department of Chemistry and Department of Physics & Astronomy, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada