1. Division of Semiconductor Materials Department of Physics Chemistry and Biology (IFM) Linköping University SE-58183 Linköping Sweden
2. Center for III-Nitride Technology C3NiT – Janzén, Linköping University SE-58183 Linköping Sweden
3. Terahertz Materials Analysis Center THeMAC Linköping University SE-58183 Linköping Sweden
4. Solid State Physics and NanoLund Lund University P. O. Box 118 221 00 Lund Sweden