Multiple Magnetic Topological Phases in Bulk van der Waals CrystalMnSb4Te7,Physical Review Letters

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Multiple Magnetic Topological Phases in Bulk van der Waals CrystalMnSb4Te7
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-06-16 , DOI: 10.1103/physrevlett.126.246601
Shuchun Huan ₁ , Shihao Zhang ₁ , Zhicheng Jiang ₂ , Hao Su ₁ , Hongyuan Wang ₁ , Xin Zhang ₁ , Yichen Yang ₂ , Zhengtai Liu ₂ , Xia Wang _{1,

3} , Na Yu _{1,

3} , Zhiqiang Zou _{1,

3} , Dawei Shen _{2,

4} , Jianpeng Liu _{1,

5} , Yanfeng Guo ₁

Affiliation

The magnetic van der Waals crystals

{MnBi}_{2} {Te}_{4} / {({Bi}_{2} {Te}_{3})}_{n}

have drawn significant attention due to their rich topological properties and the tunability by external magnetic field. Although the

{MnBi}_{2} {Te}_{4} / {({Bi}_{2} {Te}_{3})}_{n}

family have been intensively studied in the past few years, their close relatives, the

{MnSb}_{2} {Te}_{4} / {({Sb}_{2} {Te}_{3})}_{n}

family, remain much less explored. In this work, combining magnetotransport measurements, angle-resolved photoemission spectroscopy, and first principles calculations, we find that

{MnSb}_{4} {Te}_{7}

, the

n = 1

member of the

{MnSb}_{2} {Te}_{4} / {({Sb}_{2} {Te}_{3})}_{n}

family, is a magnetic topological system with versatile topological phases that can be manipulated by both carrier doping and magnetic field. Our calculations unveil that its

A

-type antiferromagnetic (AFM) ground state stays in a

Z_{2}

AFM topological insulator phase, which can be converted to an inversion-symmetry-protected axion insulator phase when in the ferromagnetic (FM) state. Moreover, when this system in the FM phase is slightly carrier doped on either the electron or hole side, it becomes a Weyl semimetal with multiple Weyl nodes in the highest valence bands and lowest conduction bands, which are manifested by the measured notable anomalous Hall effect. Our work thus introduces a new magnetic topological material with different topological phases that are highly tunable by carrier doping or magnetic field.

中文翻译：

大块范德华晶体MnSb4Te7 中的多个磁性拓扑相

磁性范德瓦尔斯晶体

{锰铋}_{2} 特_{4} / {(双_{2} 特_{3})}_{n}

由于其丰富的拓扑性质和外部磁场的可调谐性而引起了极大的关注。虽然

{锰铋}_{2} 特_{4} / {(双_{2} 特_{3})}_{n}

家庭在过去几年被深入研究，他们的近亲，

{锰锑}_{2} 特_{4} / {(锑_{2} 特_{3})}_{n}

家庭，仍然很少被探索。在这项工作中，结合磁传输测量、角分辨光电子能谱和第一性原理计算，我们发现

{锰锑}_{4} 特_{7}

，这

n = 1

的成员

{锰锑}_{2} 特_{4} / {(锑_{2} 特_{3})}_{n}

系列，是一种具有多功能拓扑相的磁拓扑系统，可以通过载流子掺杂和磁场进行操纵。我们的计算表明，它的

一种

型反铁磁 (AFM) 基态保持在

Z_{2}

AFM 拓扑绝缘体相，当处于铁磁 (FM) 状态时，可以将其转换为受反转对称保护的轴子绝缘体相。此外，当该系统在 FM 阶段在电子或空穴侧略微掺杂载流子时，它会变成在最高价带和最低导带中具有多个 Weyl 节点的 Weyl 半金属，这可以通过测量到的显着异常霍尔效应来证明. 因此，我们的工作引入了一种具有不同拓扑相的新型磁性拓扑材料，这些材料可通过载流子掺杂或磁场高度可调。

更新日期：2021-06-16

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