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Realization of asymmetric spin splitting Dirac cones in antiferromagnetic graphene/CrAs2/graphene heterotrilayer
Journal of Physics: Condensed Matter ( IF 2.7 ) Pub Date : 2020-08-05 , DOI: 10.1088/1361-648x/aba6e5
Chong Li 1 , Xiaoyu Han , Yanbo Zi , Dongfeng Hao , Junhui Wu , Fei Wang , Chun-Yao Niu , Jun-Hyung Cho , Yu Jia
Affiliation  

Nonmagnetic graphene-based van der Waals heterotrilayers exhibit peculiar electronic features such as energetically and/or spatially resolved Dirac rings/cones. Here, using first-principles calculations we study the effect of magnetic proximity effect and mirror symmetry of antiferromagnetic CrAs2 monolayer sandwiched between graphene on the Dirac cones. we clearly indentify the common vertical shift of the Dirac bands in the spin up channel. While in the spin down channel, we surprisingly observe the remarkable transverse splitting Dirac cones. The underling mechanism can be attributed to the static electric field caused by the charge transfer between the interlayers, and the polarized field arising from the weakly magnetized graphene. Both fields collectively give rise to an inequivalent space inversion broken between graphene and CrAs2 layers. Such unique Dirac states are absent in its nonmagnetic or ferromagnetic counterpart, ferromagnetic heterotrilayer with the glide symmetry, and graphene/CrAs2 heterobilayer. Our findings would provide a new insight into the correlation between Dirac cones and magnetic monolayer sandwiched between graphene.

中文翻译:

在反铁磁石墨烯/CrAs2/石墨烯异质三层中实现不对称自旋分裂狄拉克锥

基于非磁性石墨烯的范德华异质三层表现出特殊的电子特征,例如能量和/或空间分辨的狄拉克环/锥。在这里,我们使用第一性原理计算研究了狄拉克锥体上夹在石墨烯之间的反铁磁 CrAs 单层的磁性邻近效应和镜像对称性的影响。我们清楚地确定了自旋向上通道中狄拉克带的常见垂直移动。在自旋向下通道中,我们惊讶地观察到显着的横向分裂狄拉克锥体。底层机制可归因于由夹层之间的电荷转移引起的静电场,以及由弱磁化石墨烯引起的极化场。这两个场共同引起了石墨烯和 CrAs2 层之间的不等价空间反转。这种独特的狄拉克态在其非磁性或铁磁性对应物、具有滑动对称性的铁磁性异质三层和石墨烯/CrAs2 异质双层中不存在。我们的发现将为狄拉克锥与夹在石墨烯之间的磁性单层之间的相关性提供新的见解。
更新日期:2020-08-05
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