1 Max Planck Institute for the Structure and Dynamics of Matter and Center for Free Electron Laser Science, Hamburg, Germany. hannes.huebener@mpsd.mpg.de.
2 Max Planck Institute for the Structure and Dynamics of Matter and Center for Free Electron Laser Science, Hamburg, Germany. umberto.de-giovannini@mpsd.mpg.de.
3 Max Planck Institute for the Structure and Dynamics of Matter and Center for Free Electron Laser Science, Hamburg, Germany.
4 ETH Zürich, Institute of Quantum Electronics, Zürich, Switzerland.
5 Max Planck Institute for the Structure and Dynamics of Matter and Center for Free Electron Laser Science, Hamburg, Germany. angel.rubio@mpsd.mpg.de.
6 Center for Computational Quantum Physics (CCQ), The Flatiron Institute, New York, NY, USA. angel.rubio@mpsd.mpg.de.