1. INSTM
and Dipartimento di Chimica “U. Schiff”, Università degli Studi di Firenze, Sesto Fiorentino, I-50019 Firenze, Italy
2. CIC nanoGUNE, E-20018 Donostia-San Sebastian, Spain
3. Catalan
Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona
Institute of Science and Technology, Campus UAB, Bellaterra E-08193 Barcelona, Spain
4. LENS-MIND-IN2UB,
Departament d’Electrònica, Universitat de Barcelona, Martí i Franquès 1, E-08028 Barcelona, Spain
5. ICREA, Pg. Lluís Companys 23, E-08010 Barcelona, Spain
6. Vall d’Hebron Institut de Recerca (VHIR), 08035 Barcelona, Spain