Author Affiliations

A. S. Johnson,¹ D. Pérez-Salinas,¹ K. M. Siddiqui,² S. Kim,³ S. Choi,³ K. Volckaert,² P. E. Majchrzak,² S. Ulstrup,² K. Hallman,⁴ R. F. Haglund, Jr.,⁴ C. M. Günther,⁵ B. Pfau,⁶ S. Eisebitt,^5,6 D. Backes,⁷ F. Maccherozzi,⁷ A. Fitzpatrick,⁷ S. Dhesi,⁷ P. Gargiani,⁸ M. Valvidares,⁸ H. Choi,⁹ D. Jang,⁹ A. Katoch,⁹ S. Kwon,⁹ S. H. Park,⁹ H. Kim,³ and S. E. Wall^1,2

¹ICFO-Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, 08860, Castelldefels, Barcelona, Spain.

²Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000 Aarhus C, Denmark.

³Department of Physics, Sogang University, Seoul 04107, Korea

⁴Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235-1807, USA

⁵Institut für Optik und Atomare Physik, Technische Universität Berlin, 10623 Berlin, Germany.

⁶Max-Born-Institut, 12489 Berlin, Germany.

⁷Diamond Light Source, Chilton, Didcot, Oxfordshire, OX11 0DE, United Kingdom.

⁸ALBA Synchrotron Light Source, Barcelona, Spain.

⁹Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, Korea.