论文标题
磁场诱导的理想II型Weyl态在抗铁磁拓扑绝缘子MN（BI1-XSBX）2TE4中的证据
Evidence for a magnetic-field induced ideal type-II Weyl state in antiferromagnetic topological insulator Mn(Bi1-xSbx)2Te4
论文作者
论文摘要
Weyl半法（WSM）的发现引起了人们对凝结物理学的极大兴趣。 WSM需要打破反转对称性（IS）或时间反转对称性（TRS）；它们可以分为I型和II型WSM，分别以不倾斜和强烈倾斜的Weyl锥为特征。 IS或TRS破裂的I型WSM和IS型WSM的破坏已在实验中实现，但是破坏TRS的II型WSM仍然难以捉摸。在本文中，我们报告了一个理想的破坏性II型WSM，在磁场下只有一对在抗铁磁拓扑绝缘体MN（BI1-XSBX）2TE4中观察到的Weyl节点。该状态通过大型固有的异常霍尔效应表现出来，一种非平凡的$ \ mathrm {π} $ berry阶段的回旋轨道阶段以及在最佳样品组成的铁磁相中在铁磁相中具有较大的正磁性。我们的结果建立了一个有前途的平台，用于探索长期以来，理想的TRS破坏II型WSM的物理学。
The discovery of Weyl semimetals (WSMs) has fueled tremendous interest in condensed matter physics. WSMs require breaking of either inversion symmetry (IS) or time-reversal symmetry (TRS); they can be categorized into type-I and type-II WSMs, characterized by un-tilted and strongly tilted Weyl cones respectively. Type-I WSMs with breaking of IS or TRS and type-II WSMs with IS breaking have been realized experimentally, but TRS-breaking type-II WSM still remains elusive. In this article, we report an ideal TRS-breaking type-II WSM with only one pair of Weyl nodes observed in the antiferromagnetic topological insulator Mn(Bi1-xSbx)2Te4 under magnetic fields. This state is manifested by a large intrinsic anomalous Hall effect, a non-trivial $\mathrm{π}$ Berry phase of the cyclotron orbit and a large positive magnetoresistance in the ferromagnetic phase at an optimal sample composition. Our results establish a promising platform for exploring the physics underlying the long-sought, ideal TRS breaking type-II WSM.
