论文标题
在改良的Lieb晶格中透射的磁蛋白的横向运输
Transversal transport of magnons in a modified Lieb lattice
论文作者
论文摘要
我们研究了一个两波段的磁化模型，该模型的几何形状是修饰的Lieb晶格，其中一个位点被去除。三个最近的邻居之间存在各向异性铁磁交换相互作用，并且各向异性在镁能能带结构中张开一个空白。 dzyaloshinskii-moriya相互作用（DMI）诱导了非变化的浆果曲率。乐队的拓扑是微不足道的（从无效的Chern数字上），但是有限的浆果曲率会诱导其计算系数的类似霍尔的运输效应。研究了它们对温度的依赖，并显示出与文献中发现的其他磁化绝缘系统的相似之处。还研究了对交换耦合，DMI参数和外部磁场的依赖性。
We studied a two-band magnon insulating model whose geometry is that of a modified Lieb lattice in which one of the sites was removed. Anisotropic ferromagnetic exchange interactions exist between the three nearest neighbors, and the anisotropy opens a gap in the magnon energy band structure. A non-vanishing Berry curvature is induced by a Dzyaloshinskii-Moriya interaction (DMI). The topology of the bands is trivial (in the sense of a null Chern number), but the finite Berry curvature induces Hall-like transport effects whose coefficients were calculated. Their dependence on temperature was studied and shows a resemblance with other magnon insulating systems found in the literature. The dependence on exchange couplings, DMI parameter, and external magnetic field was also investigated.
