1. Department of Chemistry and Nano-Science Center, University of Copenhagen, 2100 Copenhagen Ø, Denmark
2. Department of Applied Physics and Applied Mathematics Science, Columbia University, New York, NY 10027, USA
3. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA
4. Department of Computer Science, University of Copenhagen, 2100 Copenhagen Ø, Denmark
5. Department of Neuroscience, University of Copenhagen, 2200, Copenhagen N, Denmark