1. Laboratory of Semiconductor Materials, Department of Materials and Nano Physics, School of ICT, KTH-Royal Institute of Technology, Electrum 229, 164 40 Kista, Sweden
2. Alcatel-Thales III-V Lab, THALES Research & Technology France, Campus Polytechnique, 1 avenue Augustin Fresnel, 91767 Palaiseau cedex, France
3. Laboratory of Semiconductor Materials, Department of Materials and Nano Physics, School of ICT, KTH-Royal Institute of Technology, Electrum 229, 164 40 Kista, SwedencEpiclarus AB, 164 40 Kista, Sweden
4. Harvard University, School of Engineering and Applied Sciences, 205 A Pierce Bldg, 29 Oxford Street, Cambridge, Massachusetts 0213, United States