Electric transport in three-dimensional skyrmion/monopole crystal
Electric transport in three-dimensional skyrmion/monopole crystal
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三维斯格明子/单极晶体中的电传输
DOI：
10.1103/physrevb.94.174428
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发表时间：
2016
影响因子：
3.7
通讯作者：
and Naoto Nagaosa
中科院分区：
文献类型：
--
作者：
Xiao-Xiao Zhang;Andrey S. Mishchenko;Giulio De Filippis;and Naoto Nagaosa
我们从理论上研究了由三个相互垂直的螺旋构成的三维自旋织构的输运性质，该织构实质上是由天空弦连接的单极-锑单极对的晶格。这种自旋结构是基于中子散射实验和洛伦茨电子显微镜观察得到的。利用复杂的谱分析方法，采用有限温度格林函数技术计算了该系统中的纵向直流电输运。我们考虑传导电子与拓扑非平凡自旋织构的自旋波的相互作用，其中单极出射磁场的涨落进入。我们详细研究了温度、外加磁场和特征单极运动影响下的电阻率行为，特别是描述了最新的实验观测的磁阻效应，其中发现了一个具有强关联的拓扑相变。
We study theoretically the transport properties of a three-dimensional spin texture made from three orthogonal helices, which is essentially a lattice of monopole-antimonopole pairs connected by skyrmion strings. This spin structure is proposed for MnGe based on neutron scattering experiments as well as Lorentz transmission electron microscopy observations. Equipped with a sophisticated spectral analysis method, we adopt the finite temperature Green's function technique to calculate the longitudinal dc electric transport in such a system. We consider conduction electrons interacting with spin waves of the topologically nontrivial spin texture, wherein fluctuations of monopolar emergent magnetic fields enter. We study in detail the behavior of electric resistivity under the influence of temperature, external magnetic field, and a characteristic monopole motion, especially a novel magnetoresistivity effect describing the latest experimental observations in MnGe, wherein a topological phase transition signifying strong correlations is identified.