1. IHP–Leibniz-Institut für innovative Mikroelektronik, Im Technologiepark 25, 15236 Frankfurt (Oder), Germany
2. Istituto Italiano di Tecnologia – Materials Characterization Facility, Genova 16163, Italy
3. CIC nanoGUNE BRTA, 20018 Donostia-San Sebastián, Basque Country, Spain
4. IKERBASQUE, Basque Foundation for Science, 48009 Bilbao, Spain