1. Joseph Henry Laboratory of Physics, Department of Physics, Princeton University, Princeton, NJ 08544, USA.
2. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94305, USA.
3. Department of Chemistry, Princeton University, Princeton, NJ 08544, USA.
4. Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland.
5. Physik-Institute, Universität Zürich-Irchel, CH-8057 Zürich, Switzerland.
6. Department of Physics, Northeastern University, Boston, MA 02115, USA.
7. Princeton Institute for Science and Technology of Materials, Princeton School of Engineering and Applied Science, Princeton University, Princeton, NJ 08544, USA.
8. Princeton Center for Complex Materials, Princeton University, Princeton, NJ 08544, USA.