1. School of Physics and Astronomy, Monash University, Clayton Victoria 3800, Australia
2. ARC Centre of Excellence in Future Low-Energy Electronics Technologies, Monash University, Clayton Victoria 3800, Australia
3. Australian Synchrotron, 800 Blackburn Road, Clayton Victoria 3168, Australia
4. Centre for Quantum Computation and Communication Technology, School of Physics, The University of Melbourne, Parkville Victoria 3010, Australia
5. Physik-Department, Technische Universität München, 85748 Garching, Germany
6. Chair for Theoretical Chemistry, Catalysis Research Center, Technical University of Munich, Lichtenbergstraße 4, D-85747 Garching, Germany