石墨烯
凝聚态物理
材料科学
物理
Dirac(视频压缩格式)
自旋电子学
自旋(空气动力学)
反铁磁性
拓扑绝缘体
T对称
双层石墨烯
异质结
作者
Chong Li,Xiaoyu Han,Yanbo Zi,Dongfeng Hao,Junhui Wu,Fei Wang,Chun-Yao Niu,Jun-Hyung Cho,Yu Jia
标识
DOI:10.1088/1361-648x/aba6e5
摘要
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 identify 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.
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