Intrinsic magnon Nernst effect in pyrochlore iridate thin films
Intrinsic magnon Nernst effect in pyrochlore iridate thin films
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DOI：
10.1103/physrevb.104.174410
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发表时间：
2021-07
影响因子：
3.7
通讯作者：
Bowen Ma;G. Fiete
中科院分区：
文献类型：
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作者：
Bowen Ma;G. Fiete
我们从理论上研究了沿[111]方向生长的焦绿酸盐三层薄膜中磁振子自旋热输运的强耦合方法。由于DzyaloshinskiiMoriya相互作用（DMI），基态的自旋构型是焦绿石晶格相邻四面体上的全进/全进排序。在这种状态下，系统具有反转对称性，并且能思特型热自旋电流响应得到了很好的定义。我们计算了磁振子能带响应与由自旋轨道耦合参数控制的磁振子能带拓扑的温度依赖性，并在一系列参数范围内观察了拓扑保护的手性边缘模式。我们的研究补充了先前关于薄膜焦绿石铱酸盐中的磁敏子热霍尔效应的研究，并表明[111]生长的薄膜焦绿石铱酸盐是热自旋输运和自旋热电子器件的有希望的候选材料。
We theoretically study the magnon spin thermal transport using a strong coupling approach in pyrochlore iridate trilayer thin films grown along the [111] direction. As a result of the DzyaloshinskiiMoriya interaction (DMI), the spin configuration of the ground state is an all-in/all-out ordering on neighboring tetrahedra of the pyrochlore lattice. In such a state, the system has an inversion symmetry and a Nernst-type thermal spin current response is well defined. We calculate the temperature dependence of the magnon Nernst response with respect to the magnon band topology controlled by the spin-orbit coupling parameters and observe topologically protected chiral edge modes over a range of parameters. Our study complements prior work on the magnon thermal Hall effect in thin-film pyrochlore iridates and suggests that the [111] grown thin-film pyrochlore iridates are a promising candidate for thermal spin transport and spin caloritronic devices.