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arXiv 2202.03317cond-mat.mtrl-scicond-mat.mes-hall
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非中心对称MnIn $_{2}$ Te $_{4}$中的压致磁性和拓扑转变

Pressure-induced magnetic and topological transitions in non-centrosymmetric MnIn$_{2}$Te$_{4}$

Anumita Bose, Rajdeep Banerjee, Awadhesh Narayan

摘要:

时间反演不变拓扑态的发现在近几十年来引起了人们的极大关注。然而,尽管有潜力展示各种奇异的物理,磁拓扑相位的研究滞后,由于潜在的增加了磁性的复杂性。在这项工作中,我们预测的磁性和拓扑结构的相互作用,在非中心对称的三元锰化合物MnIn $_2$ Te $_4$,使用第一性原理计算。在环境压力下,系统的基态是反铁磁绝缘体。随着应用程序的小静水压力($\sim$ 0.50 GPa),它经历了磁性转变和铁磁状态变得积极有利。在$\sim$ 2.92 GPa下,系统经历了到外尔半金属相的过渡,该外尔半金属相在本体中具有多个外尔点,并且与非平凡的表面费米弧相关联。值得注意的是,我们发现,在这个系统中的外尔点的数量可以控制的压力,这些表现在一个异常的霍尔电导率(AHC)。除了提出一种新的候选磁性拓扑材料之外,我们的工作还表明,压力可以是在磁性材料中诱导和控制拓扑相以及AHC的有效方法。这些特性可以使我们提出的材料被用作一种新型的压力控制霍尔开关。

英文摘要:

The discovery of time-reversal-invariant topological states has drawn great attention in recent decades. However, despite the potential of displaying a variety of exotic physics, the study of magnetic topological phases lags behind due to underlying added complexity of magnetism. In this work, we predict the interplay of magnetism and topology in the non-centrosymmetric ternary manganese compound MnIn$_2$Te$_4$, using first-principles calculations. At ambient pressure, the ground state of the system is an antiferromagnetic insulator. With the application of small hydrostatic pressure ($\sim$0.50 GPa), it undergoes a magnetic transition and the ferromagnetic state becomes energetically favourable. At $\sim$2.92 GPa, the system undergoes a transition into a Weyl semimetallic phase, which hosts multiple Weyl points in the bulk and is associated with non-trivial surface Fermi arcs. Remarkably, we discover that the number of Weyl points in this system can be controlled by pressure and that these manifest in an anomalous Hall conductivity (AHC). In addition to proposing a new candidate magnetic topological material, our work demonstrates that pressure can be an effective way to induce and control topological phases, as well as AHC, in magnetic materials. These properties may allow our proposed material to be used as a novel pressure-controlled Hall switch.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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