Using angle resolved photoemission spectroscopy measurements and first principle calculations, we report that the possible unconventional 2q antiferromagnetic (AFM) order in NdSb can induce unusual modulation on its electronic structure. The obvious extra bands observed in the AFM phase of NdSb are well reproduced by theoretical calculations, in which the Fermi-arc-like structures and sharp extra bands are originated from the in-gap surface states. However, they are demonstrated to be topological trivial. By tuning the chemical potential, the AFM phase of NdSb would go through a topological phase transition, realizing a magnetic topological insulator phase. Hence, our study sheds new light on the rare earth monopnictides for searching unusual AFM structure and the potential of intrinsic magnetic topological materials.

使用角分辨光电子能谱测量和第一性原理计算，我们报告 NdSb 中可能的非常规 2q 反铁磁 (AFM) 阶可以在其电子结构上引起异常调制。在 NdSb 的 AFM 相中观察到的明显额外带通过理论计算得到了很好的再现，其中费米弧状结构和尖锐的额外带起源于间隙表面状态。然而，它们被证明是拓扑平凡的。通过调节化学势，NdSb 的 AFM 相将经历拓扑相变，实现磁性拓扑绝缘体相。因此，我们的研究为稀土单磷酸盐寻找不寻常的 AFM 结构和本征磁性拓扑材料的潜力提供了新的思路。