Dzyaloshinskii-Moriya Interaction and Hall Effects in the Skyrmion Phase of Mn1-xFexGe
Dzyaloshinskii-Moriya Interaction and Hall Effects in the Skyrmion Phase of Mn1-xFexGe
复制标题
DOI：
10.1103/physrevlett.115.036602
复制
发表时间：
2015-07-14
影响因子：
8.6
通讯作者：
Mokrousov, Y.
中科院分区：
文献类型：
--
作者：
Gayles, J.;Freimuth, F.;Mokrousov, Y.
我们进行了密度泛函理论计算表明，电子动力学在Skyrmion阶段的富铁Mn 1-xFexGe合金是由贝里相物理。我们观察到Dzyaloshinskiii-Moriya相互作用的大小与混合空间-动量Berry相直接相关，随着浓度x改变符号和大小，与柴田田等人的数据直接相关。8，723（2013）]。计算的FeGe中的反常和拓扑霍尔效应也与现有的实验符合得很好。我们进一步开发了一个简单的紧束缚模型，能够解释这些发现。最后，我们表明，绝热Berry相图片违反了富锰限制的合金。
We carry out density functional theory calculations which demonstrate that the electron dynamics in the Skyrmion phase of Fe-rich Mn1-xFexGe alloys is governed by Berry phase physics. We observe that the magnitude of the Dzyaloshinskii-Moriya interaction directly related to the mixed space-momentum Berry phases, changes sign and magnitude with concentration x in direct correlation with the data of Shibata et al. [Nat. Nanotechnol. 8, 723 (2013)]. The computed anomalous and topological Hall effects in FeGe are also in good agreement with available experiments. We further develop a simple tight-binding model able to explain these findings. Finally, we show that the adiabatic Berry phase picture is violated in the Mn-rich limit of the alloys.