1. Jülich-Aachen Research Alliance, JARA, Fundamentals of Future Information Technology, D-52425 Jülich, Germany
2. Ernst Ruska-Centre (ER-C-2), Forschungszentrum Jülich, D-52425 Jülich, Germany
3. Institute of Electrical Engineering, Slovak Academy of Sciences, Dúbravská cesta 9, SK-84104 Bratislava, Slovak Republic
4. Department of Inorganic Chemistry, Institute of Chemical Technology, Technická 5, Prague 6, Czech Republic
5. Robert Bosch GmbH, D-72760 Reutlingen, Germany
6. Helmholtz Nanoelectronic Facility (HNF), Forschungszentrum Jülich, D-52425 Jülich, Germany