1. Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, 90570 Oulu, Finland
2. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
3. Department of Chemistry and Materials Science, Aalto University, Kemistintie 1, 02150 Espoo, Finland
4. Department of Electrical Engineering and Automation, School of Electrical Engineering, Aalto University, P.O.
Box 13500, 00076 Aalto, Finland
5. Department of Physics, Stanford University, Stanford, California 94305, United States
6. Department of Applied Physics, School of Science, Aalto University, P.O. Box 15100, FI 00076 Aalto, Finland
7. Center for Nanotechnology, NASA Ames Research Center, Moffett Field, California 94035, United States
8. Department of Electronics and Nanoengineering, School of Electrical Engineering, Aalto University, P.O. Box 13500, 00076 Aalto, Finland
9. Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya 26, St. Petersburg 194021, Russia
10. Jozef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia