1. Department of Materials Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
2. Centre for Materials Science and Nanotechnology, Department of Physics, University of Oslo, P.O.
Box 1048 Blindern, NO-0316 Oslo, Norway
3. Department of Energy and Process Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
4. Physikalisches Institut, Albert-Ludwigs-Universitat Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
5. Freiburg Institute for Advanced Studies, Albert-Ludwigs-Universitat Freiburg, Albertstr. 19, 79104 Freiburg, Germany
6. School of Engineering and IT, Murdoch University, 90 South Street, Murdoch, Western Australia 6150, Australia