1. Department of Physics, Sapienza University of Rome, 00185 Rome, Italy
2. Centre de Nanosciences et de Nanotechnologies (C2N), CNRS UMR 9001, Université Paris-Saclay, 91120 Palaiseau, France
3. IHP–Leibniz-Institut für Innovative Mikroelektronik, Im Technologiepark 25, D-15236 Frankfurt (Oder), Germany
4. Center for Life Nanoscience, Istituto Italiano di Tecnologia (IIT), 00169 Rome, Italy
5. School of Electronic and Electrical Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, United Kingdom