Author Affiliations

Haoyu Huang,^1,2,4,* Qinfeng Xu,² Bihu Lv,² Yuge Huang,² Chunfeng Zhang,² Xiaoyong Wang,^2,* and Min Xiao^2,3

¹Center for Free-Electron Laser Science, DESY, Notkestraße 85, 22607 Hamburg, Germany

²National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

³Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, United States

⁴Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany

^*Corresponding author: haoyu.huang@desy.de, wxiaoyong@nju.edu.cn