Magnon Hall effect and topology in kagome lattices: A theoretical investigation
Magnon Hall effect and topology in kagome lattices: A theoretical investigation
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DOI：
10.1103/physrevb.89.134409
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发表时间：
2014-04-14
影响因子：
3.7
通讯作者：
Mertig, Ingrid
中科院分区：
文献类型：
--
作者：
Mook, Alexander;Henk, Juergen;Mertig, Ingrid
具有Dzyaloshinskii-Moriya相互作用的铁磁绝缘体表现出磁振子霍尔效应，即在施加温度梯度时产生横向热流。在这一理论研究中，我们建立了二维kagome晶格中的磁振子霍尔效应与其磁振子色散关系拓扑结构的密切联系。从拓扑相图中，我们预测了热流随温度变化的符号变化。进一步推导出热霍尔电导率的高温极限；这个量为磁振子霍尔效应的最大强度提供了一个价值值。最后，我们将三维焦绿石Lu2V2O7的磁振子霍尔电导率与实验结果的温度和场依赖性进行了比较。
Ferromagnetic insulators with Dzyaloshinskii-Moriya interaction show the magnon Hall effect, i.e., a transverse heat current upon application of a temperature gradient. In this theoretical investigation we establish a close connection of the magnon Hall effect in two-dimensional kagome lattices with the topology of their magnon dispersion relation. From the topological phase diagram we predict systems which show a change of sign in the heat current in dependence on temperature. Furthermore, we derive the high-temperature limit of the thermal Hall conductivity; this quantity provides a figure of merit for the maximum strength of the magnon Hall effect. Eventually, we compare the temperature and field dependence of the magnon Hall conductivity of the three-dimensional pyrochlore Lu2V2O7 with experimental results.