1. Faculty of Electrical Engineering and Information Technology, Chair of Electronic Devices, RWTH Aachen University, Otto-Blumenthal-Str. 2, 52074 Aachen, Germany
2. AMO GmbH, Otto-Blumenthal-Str. 25, 52074 Aachen, Germany
3. Department of Electrical Engineering, Stanford University, Stanford, California 94305, United States
4. IHP—Leibniz-Institut für innovative Mikroelektronik, 15236 Frankfurt (Oder), Germany