论文标题
可调的异常大厅运输批量和二维1 $ t $ -crte $ _ {2} $：第一原理研究
Tunable anomalous Hall transport in bulk and two-dimensional 1$T$-CrTe$_{2}$: A first-principles study
论文作者
论文摘要
具有稳健磁性的分层材料吸引了重大的研究兴趣。在最近的实验中，一种新的分层材料1 $ t $ -crte $ _ {2} $已合成，并表现出在室温之上的铁磁性。在这里，根据第一原理计算，我们研究了批量和二维（2D）限制的1 $ t $ -crte $ _ {2} $的电子，磁性和传输性能。我们表明，1 $ t $ -crte $ _ {2} $可以以单层形式稳定，并且具有低的去角质能量。单层结构是一种固有的铁磁金属，它在室温高于室温的温度下保持较高的温度。特别是，我们在异常的大厅运输中揭示了有趣的功能。我们表明，在基础状态下，散装和单层1 $ t $ -crte $ _ {2} $具有消失的异常大厅效应，因为磁化值保留了一个垂直镜像对称性。可以通过调谐磁化方向或破坏镜像对称性的单轴菌株来使异常的霍尔电导率相当。房间温度的2D铁磁性和可调的异常大厅效应使该材料成为纳米级设备应用的有前途的平台。
Layered materials with robust magnetic ordering have been attracting significant research interest. In recent experiments, a new layered material 1$T$-CrTe$_{2}$ has been synthesized and exhibits ferromagnetism above the room temperature. Here, based on first-principles calculations, we investigate the electronic, magnetic, and transport properties of 1$T$-CrTe$_{2}$, both in the bulk and in the two-dimensional (2D) limit. We show that 1$T$-CrTe$_{2}$ can be stable in the monolayer form, and has a low exfoliation energy. The monolayer structure is an intrinsic ferromagnetic metal, which maintains a high Curie temperature above the room temperature. Particularly, we reveal interesting features in the anomalous Hall transport. We show that in the ground state, both bulk and monolayer 1$T$-CrTe$_{2}$ possess vanishing anomalous Hall effect, because the magnetization preserves one vertical mirror symmetry. The anomalous Hall conductivity can be made sizable by tuning the magnetization direction or by uniaxial strains that break the mirror symmetry. The room-temperature 2D ferromagnetism and the tunable anomalous Hall effect make the material a promising platform for nanoscale device applications.
