Topological properties of multilayer magnon insulators
Topological properties of multilayer magnon insulators
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多层磁振子绝缘体的拓扑性质
DOI：
10.1103/physrevb.104.064427
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发表时间：
2020-08
影响因子：
3.7
通讯作者：
S. Hofer;T. Datta;S. Tewari;D. Mazumdar
中科院分区：
文献类型：
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作者：
S. Hofer;T. Datta;S. Tewari;D. Mazumdar
二维磁绝缘体是拓扑磁振子的理想宿主。在这项研究中，我们表明，ABC堆叠的蜂窝晶格多层膜与交替Dzyaloshinskiii-Moriya相互作用（Dzyaloshinskiii-Moriya）揭示了丰富的拓扑磁振子相图。基于我们的能带结构和Berry曲率的计算，我们证明了跳跃的热霍尔行为，证实了拓扑相变触发调整的介电层和层间耦合。我们将一般多层膜的相图与双层和三层系统联系起来。我们发现一个偶奇效应之间的多层膜中，偶数层显示没有跳跃的热霍尔电导率，但奇数层。我们还观察到拓扑邻近效应的存在，在我们的三层。我们的结果提供了新的方案来操纵陈数和它们的可测量的影响，在拓扑磁振子系统。
Two-dimensional magnetic insulators can be promising hosts for topological magnons. In this study, we show that ABC-stacked honeycomb lattice multilayers with alternating Dzyaloshinskii-Moriya interaction (DMI) reveal a rich topological magnon phase diagram. Based on our bandstructure and Berry curvature calculations, we demonstrate jumps in the thermal Hall behavior that corroborate with topological phase transitions triggered by adjusting the DMI and interlayer coupling. We connect the phase diagram of generic multilayers to a bilayer and a trilayer system. We find an even-odd effect amongst the multilayers where the even layers show no jump in thermal Hall conductivity, but the odd layers do. We also observe the presence of topological proximity effect in our trilayer. Our results offer new schemes to manipulate Chern numbers and their measurable effects in topological magnonic systems.