1. NaMLab gGmbH, Noethnitzer Str. 64, D-01187 Dresden, Germany
2. Imec, Kapeldreef 75, B-3001 Leuven, Belgium
3. Department of Physics
and Astronomy, and the University of South Carolina Nanocenter, University of South Carolina, Columbia, South Carolina 29208, United States
4. Chair of
Nanoelectronic Materials, TU Dresden, D-01062 Dresden, Germany