1. Institute of Integrated Photonics, RWTH Aachen University,Aachen,Germany
2. Institut für Halbleitertechnik, University of Stuttgart,Stuttgart,Germany
3. Peter Grünberg Institute,Jülich,Germany
4. Leibniz Institute for Advanced Microelectronics (IHP),Frankfurt-an-der-Oder,Germany
5. School of Electronic and Electrical Engineering, University of Leeds,Leeds,United Kingdom,LS2 9JT
6. University of Erlangen,Lehrstuhl für Elektronische Bauelemente,Erlangen,Germany