|
Multiple surface states, nontrivial band topology, and antiferromagnetism in GdAuAl4Ge2
Chengcheng Zhang(张成成), Yuan Wang(王渊), Fayuan Zhang(张发远), Hongtao Rong(戎洪涛), Yongqing Cai(蔡永青), Le Wang(王乐), Xiao-Ming Ma(马小明), Shu Guo(郭抒), Zhongjia Chen(陈仲佳), Yanan Wang(王亚南), Zhicheng Jiang(江志诚), Yichen Yang(杨逸尘), Zhengtai Liu(刘正太), Mao Ye(叶茂), Junhao Lin(林君浩), Jiawei Mei(梅佳伟), Zhanyang Hao(郝占阳), Zijuan Xie(谢子娟), and Chaoyu Chen(陈朝宇)
2023 (7):
77401-077401.
doi: 10.1088/1674-1056/acca0e
Magnetic topological states of matter provide a fertile playground for emerging topological physics and phenomena. The current main focus is on materials whose magnetism stems from 3d magnetic transition elements, e.g., MnBi$_{{2}}$Te$_{4}$, Fe$_{{3}}$Sn$_{{2}}$, and Co$_{3}$Sn$_{{2}}$S$_{2}$. In contrast, topological materials with the magnetism from rare earth elements remain largely unexplored. Here we report rare earth antiferromagnet GdAuAl$_{{4}}$Ge$_{{2}}$ as a candidate magnetic topological metal. Angle resolved photoemission spectroscopy (ARPES) and first-principles calculations have revealed multiple bulk bands crossing the Fermi level and pairs of low energy surface states. According to the parity and Wannier charge center analyses, these bulk bands possess nontrivial $Z_{{2}}$ topology, establishing a strong topological insulator state in the nonmagnetic phase. Furthermore, the surface band pairs exhibit strong termination dependence which provides insight into their origin. Our results suggest GdAuAl$_{{4}}$Ge$_{2}$ as a rare earth platform to explore the interplay between band topology, magnetism and f electron correlation, calling for further study targeting on its magnetic structure, magnetic topology state, transport behavior, and microscopic properties.
参考文献 |
补充材料 |
相关文章 |
计量指标
|