1. Physik-Department, Technische Universität München, James-Franck-Strasse 1, 85748 Garching bei München, Germany
2. Triumf, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
3. Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
4. Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
5. School of Mathematical and Physical Sciences, University of Technology Sydney, Broadway, NSW 2007, Australia
6. Electron Microscopy Centre, Australian Institute for Innovative Materials, University of Wollongong, North Wollongong, NSW 2500, Australia