1. Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway
2. Department of Physics, Aberystwyth University, Aberystwyth SY23 3BZ, United Kingdom
3. School of Physics & Astronomy, Monash University, 1 Wellington Rd., Clayton, Victoria 3800, Australia
4. School of Physics, HH Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom
5. School of Chemistry, University of Bristol, Cantocks Close, Bristol BS8 1TS, United Kingdom
6. Department of Interface Science, Fritz-Haber-Institute of the Max-Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
7. Australian Synchrotron, 800 Blackburn Rd., Clayton, Victoria 3168, Australia
8. Semiconductor Physics, Department of Physics, University of Oslo (UiO), NO-0371 Oslo, Norway