1. Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland
2. CENTERA Laboratory, Institute for High Pressure Physics, Polish Academy of Sciences, Sokołowska 29, 01-142 Warsaw, Poland
3. Faculty of Physics and Applied Informatics, University of Łódź, Pomorska 149/153, 90-236 Łódź, Poland
4. Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
5. AIXTRON Ltd, Buckingway Business Park, Anderson Road, Swavesey, Cambridge CB24 4FQ, U.K.
6. Laboratory of Nanoscale Biology, Swiss Federal Institute of Technology Lausanne (EPFL), Station 17, CH-015 Lausanne, Switzerland