1. Department of Applied Physics, QTF Centre of Excellence, Aalto University School of Science, P.O. Box 11100, FI-00076 Aalto, Finland
2. Department of Applied Mathematics, The University of Western Ontario, London, Ontario N6A 5B7, Canada
3. Center for Advanced Materials and Biomaterials Research, The University of Western Ontario, London, Ontario N6A 3K7, Canada
4. Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
5. Interdisciplinary Centre for Mathematical Modelling, Department of Mathematical Sciences, Loughborough University, Loughborough, Leicestershire LE11 3TU, United Kingdom