Vienna University of Technology - Institute of Solid State Physics, Vienna University of Technology - Institute of Solid State Physics, Vienna University of Technology - Institute of Solid State Physics, Vienna University of Technology - Institute of Solid State Physics, Vienna University of Technology - Institute of Solid State Physics, Department of Advanced Materials Science, The University of Tokyo, Department of Advanced Materials Science, The University of Tokyo, Department of Advanced Materials Science, The University of Tokyo, National Institute for Materials Science - International Center for Materials Nanoarchitectonics (MANA) and Vienna University of Technology - Institute of Solid State Physics