Direct imaging of valence orbitals using hard x-ray photoelectron spectroscopy oleh Daisuke Takegami, Laurent Nicolaï, Yuki Utsumi, Anna Meléndez-Sans, Daria A. Balatsky, Cariad-A. Knight, Connor Dalton, Shao-Lun Huang, Chi-Sheng Chen, Li Zhao, Alexander C. Komarek, Yen-Fa Liao, Ku-Ding Tsuei, Ján Minár, Liu Hao Tjeng