Weyl magnons in pyrochlore antiferromagnets with an all-in-all-out order

Weyl magnons in pyrochlore antiferromagnets with an all-in-all-out order
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烧绿石反铁磁体中的韦尔磁振子具有全进全出的顺序

DOI:
10.1103/physrevb.97.115162
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发表时间:
2017-08
期刊:
影响因子:
3.7
通讯作者:
Wenxing Nie
Wenxing Nie
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Shao-Kai Jian;Wenxing Nie

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我们研究了具有全进全出(AIAO)磁序的烧绿石反铁磁体的新型拓扑磁振子带交叉。通过一般对称性分析和自旋波理论,我们证明了具有AIAO有序的烧绿石材料在外加磁场或单轴应变下都可以容纳Weyl磁振子。在小磁场下,具有AIAO背景的烧绿石的磁振子带可以具有两个带相反电荷的Weyl点,这是量子材料中可实现的最少数量的Weyl点,迄今为止还没有实验观察到。我们进一步表明,呼吸pyrophores与AIAO订单可以表现出外尔磁振子单轴应变。这些发现适用于任何烧绿石材料支持AIAO订单,无论形式的相互作用。具体而言,我们表明,外尔磁振子是强大的直接(积极)Dzyaloshinskiii-Moriya相互作用。由于烧绿石磁体中无处不在的AIAO有序(包括R$_2$Ir$_2$O$_7$)以及实验上可实现的外部应变和磁场,我们的预测为见证量子磁体中的外尔磁振子提供了有希望的竞技场。
We investigate novel topological magnon band crossings of pyrochlore antiferromagnets with all-in-all-out (AIAO) magnetic order. By general symmetry analysis and spin-wave theory, we show that pyrochlore materials with AIAO orders can host Weyl magnons under external magnetic fields or uniaxial strains. Under a small magnetic field, the magnon bands of the pyrochlore with AIAO background can feature two opposite-charged Weyl points, which is the minimal number of Weyl points realizable in quantum materials and has not be experimentally observed so far. We further show that breathing pyrochlores with AIAO orders can exhibit Weyl magnons upon uniaxial strains. These findings apply to any pyrochlore material supporting AIAO orders, irrespective of the forms of interactions. Specifically, we show that the Weyl magnons are robust against direct (positive) Dzyaloshinskii-Moriya interactions. Because of the ubiquitous AIAO orders in pyrochlore magnets including R$_2$Ir$_2$O$_7$, and experimentally achievable external strain and magnetic field, our predictions provide promising arena to witness the Weyl magnons in quantum magnets.
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