1. Bio-Nanotechnology and Nanomedicine Laboratory, Department of Chemistry & Nano-Science Center, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
2. Laboratory of Semiconductor Materials, Institute of Materials,
School of Engineering, EPFL, 1015 Lausanne, Switzerland
3. Danish Fundamental Metrology A/S, Matematiktorvet 307, 2800 Kgs. Lyngby, Denmark
4. Nano-Science Center & Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
5. Nano-Science Center/Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark