1. Institute of Physics Faculty of Electrical Engineering and Information Technology Universität der Bundeswehr München 85577 Neubiberg Germany
2. AMO GmbH Advanced Microelectronics Center Aachen (AMICA) Otto‐Blumenthal‐Str. 25 52074 Aachen Germany
3. Chair of Electronic Devices RWTH Aachen University Otto‐Blumenthal‐Str. 2 52074 Aachen Germany
4. Tyndall National Institute University College Cork MicroNano Systems Centre Lee Maltings, Dyke Parade Cork T12 R5CP Ireland