1. Catalan Institute
of Nanoscience and Nanotechnology (ICN2), CSIC, and The Barcelona
Institute of Science and Technology, UAB Campus, 08193 Bellaterra, Barcelona, Spain
2. NIL Technology
ApS, Diplomvej 381, DK-2800 Kongens Lyngby, Denmark
3. Karlsruhe Institute of Technology (KIT), D-76344 Eggenstein Leopoldshafen, Germany
4. ICREA, Institució
Catalana de Recerca i Estudis Avançats, 08010 Barcelona, Spain