1. University College London–Department of Physics and Astronomy, Gower Street, London WC1E 6BT, United Kingdom
2. Institute of Solid State Physics–Graz University of Technology, Petersgasse 16, 8010 Graz, Austria
3. KAI GmbH, Europastraße 8, 9500 Villach, Austria
4. Infineon Technologies Austria AG, Siemensstraße 2, 9500 Villach, Austria