Giant and reversible electronic structure evolution in a magnetic topological material EuCd 2 As 2

作者：Yang Wang, Cong Li, Taimin Miao, Shuai Zhang, Yong Li, Liqin Zhou, Meng Yang, Chaohui Yin, Yongqing Cai, Chunyao Song, Hailan Luo, Hao Chen, Hanqing Mao, Lin Zhao, Hanbin Deng, Yingkai Sun, Changjiang Zhu, Fengfeng Zhang, Yang Feng, Zhimin Wang, Shenjin Zhang, Qinjun Peng, Shuheng Pan, Youguo Shi, Hongming Weng, Tao Xiang, Zuyan Xu, Xingjiang Zhou · 发表于：Physical review. B./Physical review. B · 年份：2022 · DOI：10.1103/physrevb.106.085134 · 被引用次数：16 · 研究领域：Topological Materials and Phenomena、Advanced Condensed Matter Physics、Magnetic and transport properties of perovskites and related materials

The electronic structure and the physical properties of quantum materials can be significantly altered by charge carrier doping and magnetic state transition. Here we report a discovery of a giant and reversible electronic structure evolution with doping in a magnetic topological material. By performing high-resolution angle-resolved photoemission measurements on ${\mathrm{EuCd}}_{2}{\mathrm{As}}_{2}$, we found that a huge amount of hole doping can be introduced into the sample surface due to surface absorption. The electronic structure exhibits a dramatic change with the hole doping which cannot be described by a rigid band shift. Prominent band splitting is observed at high doping which corresponds to a doping-induced magnetic transition at low temperature (below $\ensuremath{\sim}15$ K) from an antiferromagnetic state to a ferromagnetic state. These results have established a detailed electronic phase diagram of ${\mathrm{EuCd}}_{2}{\mathrm{As}}_{2}$ where the electronic structure and the magnetic structure change systematically and dramatically with the doping level. They further suggest that the transport, magnetic, and topological properties of ${\mathrm{EuCd}}_{2}{\mathrm{As}}_{2}$ can be greatly modified by doping. This work will stimulate further investigations to explore for new phenomena and properties in doping this magnetic topological material.