Wenbin Wu, Zeping Shi, Mykhaylo Ozerov, Yuhan Du, Yuxiang Wang, Xiao-Sheng Ni, Xianghao Meng, Xiangyu Jiang, Guangyi Wang, Congming Hao, Xinyi Wang, Pengcheng Zhang, Chunhui Pan, Haifeng Pan, Zhenrong Sun, Run Yang, Yang Xu, Yusheng Hou, Zhongbo Yan, Cheng Zhang, Hai-Zhou Lu, Junhao Chu, Xiang Yuan
Arising from the extreme/saddle point in electronic bands, Van Hove singularity (VHS) manifests divergent density of states (DOS) and induces various new states of matter such as unconventional superconductivity. VHS is believed to exist in one and two dimensions, but rarely found in three dimension (3D). Here, we report the discovery of 3D VHS in a topological magnet EuCd2 As2 by magneto-infrared spectroscopy. External magnetic fields effectively control the exchange interaction in EuCd2 As2 , and shift 3D Weyl bands continuously, leading to the modification of Fermi velocity and energy dispersion...
March 14, 2024: Nature Communications