Ahmed, Towfiq [P:(DE-HGF)0] ; Albers, R. C. [P:(DE-HGF)0] ; Balatsky, A. V. [P:(DE-HGF)0] ; Friedrich, Christoph [P:(DE-Juel1)130644] ; Zhu, Jian-Xin [P:(DE-HGF)0]