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arXiv 2108.08459cond-mat.mes-hallcond-mat.mtrl-sci
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磁偶极子阵列中的内禀拓扑磁振子

Intrinsic topological magnons in arrays of magnetic dipoles

Paula Mellado

摘要:

本文研究了一个简单的磁系统,它由具有易磁化轴的周期调制磁偶极子组成。在单独调节调制幅度时,链和二维堆叠链表现出丰富的磁振子谱,其中频率间隙和磁振子速度是容易操纵的。由于磁体之间的偶极相互作用和几何调制引起的各向异性的混合在无限链中诱导具有分数Zak数的磁相,并且在开放的一维系统中诱导具有端态的磁相。在二维中,它在条纹的边缘产生拓扑模式。在二维晶格中,振幅调谐引起能带接触,从而触发体能带的陈数交换,并切换热导率的符号。

英文摘要:

We study a simple magnetic system composed of periodically modulated magnetic dipoles with an easy axis. Upon adjusting the modulation amplitude alone, chains and two-dimensional stacked chains exhibit a rich magnon spectrum where frequency gaps and magnon speeds are easily manipulable. The blend of anisotropy due to dipolar interactions between magnets and geometrical modulation induces a magnetic phase with fractional Zak number in infinite chains and end states in open one-dimensional systems. In two dimensions it gives rise to topological modes at the edges of stripes. Tuning the amplitude in two-dimensional lattices causes a band touching, which triggers the exchange of the Chern numbers of the volume bands and switches the sign of the thermal conductivity.

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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