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arXiv 2109.07083cond-mat.mes-hall
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涡阵中的Ⅱ型Weyl激励

Type-II Weyl Excitation in Vortex Arrays

Z. -X. Li, X. S. Wang, Lingling Song, Yunshan Cao, Peng Yan

摘要:

有序磁体中的类外尔磁振子激发最近引起了人们的极大关注。尽管外尔磁振子具有诱人的物理和应用前景,但由于其非常高的频率,微带天线技术无法实现,因此对其进行实验观测仍然具有挑战性。在这里,我们预测千兆赫兹外尔激发的偶极耦合磁涡旋排列在一个三维堆叠蜂窝晶格的集体动力学。研究发现,反转对称性破缺导致了具有倾斜色散的第二类Weyl半金属态的出现。我们推导出支持WSM的涡旋阵列的完整相图,WSM具有单对和双对Weyl节点,以及拓扑绝缘体相。我们观察到强大的弧表面状态的双段的方式,由于倾斜的性质,II型WSM。我们的研究结果揭示了低频WSM相的磁性织构为基础的晶体,是必不可少的未来Weyltronic应用。

英文摘要:

Weyl-like magnon excitations in ordered magnets have attracted significant recent attention. Despite of the tantalizing physics and application prospects, the experimental observation of Weyl magnons is still challenging owing to their extraordinarily high frequency that is not accessible to the microstrip antenna technique. Here we predict gigahertz Weyl excitations in the collective dynamics of dipolar-coupled magnetic vortices arranged in a three-dimensional stacked honeycomb lattice. It is found that the inversion symmetry breaking leads to the emergence of the type-II Weyl semimetal (WSM) state with tilted dispersion. We derive the full phase diagram of the vortex arrays that support WSMs with both single and double pairs of Weyl nodes, and the topological insulator phase. We observe robust arc surface states in a dual-segment fashion due to the tilted nature of type-II WSMs. Our findings uncover the low-frequency WSM phase in magnetic texture based crystals that are indispensable for future Weyltronic applications.

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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