1. Physics Department E20, Technical University of Munich, Garching D-85748, Germany
2. Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, UK
3. Department of Materials, Imperial College London, South Kensington, London SW7 2AZ, UK
4. Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK
5. Department of Physics, University of Warwick, Coventry CV4 7AL, UK
6. National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
7. Research laboratories of Saigon Hi-Tech Park, Lot I3, N2 street, Đ. D1, Phuòng Tân Phú, Quân 9 Hochiminh City, Vietnam