1. Department of Micro- and Nanoelectronic Systems, Institute of Micro and Nanoelectronics, Faculty of Electrical Engineering and Information Technology, Ilmenau University of Technology, Gustav-Kirchhoff-Straße 1, Ilmenau 98693, Germany
2. Molecular Foundry, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
3. Oxford Instruments, 300 Baker Avenue, Suite 150, Concord, Massachusetts 01742, USA