1. Department of Electrical Engineering (ESAT), KU Leuven, Kasteelpark Arenberg 10, B-3001 Heverlee, Belgium
2. imec, Kapeldreef 75, B-3001 Heverlee, Belgium
3. Institute for Molecular Engineering, University of Chicago, 5747 South Ellis Avenue, Chicago, Illinois 60637, United States
4. JSR Micro N.V., Technologielaan 8, B-3001 Leuven, Belgium