1. Department of Material Science and Physical ChemistryUniversity of Barcelona Martí i Franquès, 1 08028 Barcelona Spain
2. Institute for Bioengineering of Catalonia (IBEC)The Barcelona Institute of Science and Technology Baldiri Reixac 10–12 08028 Barcelona Spain
3. Network Biomedical Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN) 28029 Madrid Spain
4. Present address: Institut für Angewandte PhysikTU Wien Vienna Austria
5. Present address: Smart Materials, NanophysicsIstituto Italiano di Tecnologia Genova Italy
6. Laboratory of BiophysicsWageningen University 6700 ET Wageningen The Netherlands
7. Inorganic and Organic Chemistry Department & Institute of Theoretical and Computational Chemistry (IQTCUB)University of Barcelona (UB) Martí i Franquès, 1 Barcelona 08028 Spain
8. Catalan Institution for Research and Advanced Studies (ICREA) 08010 Barcelona Spain
9. Biophysics of Photosynthesis. Dep. Physics and AstronomyFaculty of SciencesVrije Universiteit Amsterdam De Boelelaan 1081 1081 HV Amsterdam The Netherlands
10. Present address: Department of Chemistry, Faculty of Natural & Mathematical SciencesKing's College London London UK