1. Center for Hybrid Nanostructures (CHyN), Universität Hamburg, 22761 Hamburg, Germany
2. Materials Science and Engineering Department, University of Utah, Salt Lake City, Utah 84112, United States
3. Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
4. The Hamburg Centre for Ultrafast Imaging CUI, 22761 Hamburg, Germany
5. Materials Science and Engineering, College of Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States