1. NEST
2. Scuola Normale Superiore and Istituto Nanoscienze-CNR
3. 56127 Pisa
4. Italy
5. Fondazione Bruno Kessler
6. Centre for Materials and Microsystems
7. Micro Nano Facility
8. 38123 Trento
9. Fondazione Umberto Veronesi
10. Helmholtz-Zentrum Dresden-Rossendorf
11. Institute of Ion Beam Physics and Materials Research
12. 01328 Dresden
13. Germany