1. Walter Schottky Institute (WSI) and Physics Department, Technische Universität München, Am Coulombwall 4, 85748 Garching bei München, Germany
2. Dipartimento Politecnico di Ingegneria e Architettura (DPIA), Università degli Studi di Udine, Via delle Scienze 206, 33100 Udine, Italy
3. Dipartimento di Ingegneria “Enzo Ferrari”, Università degli Studi di Modena e Reggio Emilia, Via Vivarelli 10, 41125 Modena, Italy
4. Molecular Electronics, Department of Electrical and Computer Engineering, Technische Universität München, Theresienstr. 90, 80333 München, Germany
5. Fraunhofer Research Institution for Microsystems and Solid State Technologies (EMFT), Hansastr. 27d, 80686 München, Germany
6. Center for Nanoscience (CeNS), Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 München, Germany