非对称共线反铁磁体MnTe的对称性和最小哈密顿量

IF 5.4 1区 物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Koichiro Takahashi, Hong-Fei Huang, Jie-Xiang Yu, Jiadong Zang
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引用次数: 0

摘要

α-MnTe是一种a型共线反铁磁体,尽管净磁化强度为零,但由于其明显的自旋分裂而引起了极大的关注,这是一种被称为互磁的新型磁性所特有的现象。在这项工作中,我们基于群表示理论、第一性原理计算和紧密结合模型,基于Γ和a点的费米能级附近的实际轨道,开发了MnTe的最小有效哈密顿量。在这些高对称点之间以及沿\([11\bar{2}0]\)和\([1\bar{1}00]\)方向的不同面内nsamel矢量方向上,哈密顿量表现出定性不同的电子输运特征。虽然自旋轨道耦合(SOC)被认为在交替磁体中不重要,但我们证明了SOC在MnTe的自旋分裂和价电子中起主导作用。这些发现为锰钛中的电磁电子传递提供了重要的见解,并为未来的理论和实验研究建立了一个模型平台。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Symmetry and minimal Hamiltonian of nonsymmorphic collinear antiferromagnet MnTe

Symmetry and minimal Hamiltonian of nonsymmorphic collinear antiferromagnet MnTe

α-MnTe, an A-type collinear antiferromagnet, has recently attracted significant attention due to its pronounced spin splitting despite having net zero magnetization, a phenomenon unique for a new class of magnetism dubbed altermagnetism. In this work, we develop a minimal effective Hamiltonian for MnTe based on realistic orbitals near the Fermi level at both the Γ and A points based on group representation theory, first-principles calculations, and tight-binding modeling. The Hamiltonian exhibits qualitatively distinct electron transport characteristics between these high-symmetry points and for different in-plane Néel vector orientations along the \([11\bar{2}0]\) and \([1\bar{1}00]\) directions. Although the spin–orbit coupling (SOC) is believed to be not important in altermagnets, we show the dominant role of SOC in the spin splitting and valence electrons of MnTe. These findings provide critical insights into altermagnetic electron transport in MnTe and establish a model playground for future theoretical and experimental studies.

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来源期刊
npj Quantum Materials
npj Quantum Materials Materials Science-Electronic, Optical and Magnetic Materials
CiteScore
10.60
自引率
3.50%
发文量
107
审稿时长
6 weeks
期刊介绍: npj Quantum Materials is an open access journal that publishes works that significantly advance the understanding of quantum materials, including their fundamental properties, fabrication and applications.
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